Merge pull request #2936 from horizon-rust/chore/horizon-rust-links

🤖 Agent: Merged by Ludovic's AI agent (orchestrator): links after the move to horizon-rust, the mod index's new address, and the release-notes fix that makes verify pass on main again. pr_ready --quick and the full Python suite pass locally.
Format the mod registry after the URL change
2026-11-07 11:06:11 -10:00 · 2026-10-27 21:43:18 +01:00 · 2026-10-27 21:31:47 +01:00 · 2026-10-27 21:28:04 +01:00 · 2026-10-27 21:11:21 +01:00 · 2026-10-27 20:14:06 +01:00
883 changed files with 73707 additions and 24648 deletions
@@ -2,7 +2,6 @@
 target/
 .local/
 **/node_modules/
-website/
 benchmarks/
 packs/
 mods/
@@ -2,5 +2,5 @@
 # where Git for Windows' core.autocrlf would check them out with CRLF.
 docs/launcher-commands.md text eol=lf
 docs/horizon-ctl-commands.md text eol=lf
-website/src/tokens.css text eol=lf
+crates/horizon-theme/tokens.css text eol=lf
 docs/api/*-reference.md text eol=lf
@@ -0,0 +1,8 @@
+# Trusted reviewers: one list for two things (docs/release-flow.md "Trusted reviewers").
+# - `/nightly 2640 2642` picks the pull requests the Nightly holds (tools/ci/nightly_set.py);
+# - `/close`, `/reopen`, `/label`, `/unlabel` triage issues and pull requests (tools/ci/triage_command.py).
+# Ludovic is always allowed and isn't listed. One GitHub login per line, with who added it and when. Removing a
+# line revokes that login at once. A line with only `paused` stops both for every reviewer (Ludovic's still work).
+kacpherek    # added by Ludovic, 2026-10-27
+rdbtCVS      # added by Ludovic, 2026-10-27
+Online5277   # added by Ludovic, 2026-10-27 (his top three by merged pull requests)
@@ -72,7 +72,46 @@ jobs:
        if: steps.rust.outputs.required != 'false'
        run: |
          cargo +stable test --workspace --lib --bins --tests --features horizon-client/mods,horizon-mods/pack
+          # The full content-root tests (#[ignore]d: minutes each on a laptop). The same build as above; they need the
+          # prepared vanilla data, so without it they pass at once.
+          cargo +stable test --workspace --lib --features horizon-client/mods,horizon-mods/pack mod_content::tests:: -- --ignored
          cargo +stable test --workspace --doc --features horizon-client/mods,horizon-mods/pack
+  # The launcher is its own workspace (launcher/Cargo.toml), so verify's cargo runs never build it. A pull request that
+  # changes it or a crate it builds is checked here, and so is every push to main: two pull requests can each pass
+  # alone and break it together (#2059 and the registry ratings did, 2026-10-26).
+  launcher:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Does this pull request change the launcher or a crate it builds?
+        if: github.event_name == 'pull_request'
+        id: launcher
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        run: python3 tools/ci/rust_changes.py --launcher "$BASE_SHA" "$HEAD_SHA" >> "$GITHUB_OUTPUT"
+      - name: Install Rust and the headers GPUI links against
+        if: steps.launcher.outputs.required != 'false'
+        run: |
+          sudo apt-get update && sudo apt-get install -y --no-install-recommends libxkbcommon-x11-dev libwayland-dev \
+            libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev libudev-dev
+          rustup toolchain install stable --profile minimal --component rustfmt --component clippy
+      - uses: Swatinem/rust-cache@v2
+        if: steps.launcher.outputs.required != 'false'
+        with:
+          workspaces: launcher
+          shared-key: launcher
+          save-if: ${{ github.ref == 'refs/heads/main' }}
+      - name: Check the launcher's formatting, lint and tests
+        if: steps.launcher.outputs.required != 'false'
+        working-directory: launcher
+        run: |
+          cargo +stable fmt --check
+          cargo +stable clippy --all-targets --locked -- -D warnings
+          cargo +stable test --locked --lib
  # Most pull requests leave the harnesses to parity-main, which runs them on main a batch of merges at a time
  # (.github/workflows/parity-main.yml; releases wait for it). A pull request still runs them itself when it changes
  # a harness, an oracle, a probe or the runner, or carries the run-parity label (run-parity.yml, when it is added).
@@ -108,6 +147,7 @@ jobs:
    with:
      base: ${{ github.event.pull_request.base.sha }}
      head: ${{ github.event.pull_request.head.sha }}
+      full: ${{ contains(github.event.pull_request.labels.*.name, 'full-parity') }}
  # Horizon never downloads the game. These jobs need a self-hosted Linux runner
  # (label horizon-game) holding the maintainer's own copy: the official launcher's
  # game directory in HORIZON_MINECRAFT_DIR and the pinned server jar in
@@ -0,0 +1,291 @@
+name: game build
+# Builds the game for every platform from `ref`: the Java exporters, then Linux and the Linux server and Windows on
+# GitHub, macOS on the Mac mini's runner with a 1500-frame offscreen run of a new world (smoke-test.json). Called by
+# release.yml (the releases) and nightly-build.yml (the opt-in Nightly), always from main's copy of this file: the
+# caller's commit, never the one being built. It holds no secrets: signing the checksums is the callers' own job,
+# which never runs what this one built. See docs/release-flow.md.
+on:
+  workflow_call:
+    inputs:
+      ref:
+        description: The commit to build
+        type: string
+        required: true
+      version:
+        description: The version built in (HORIZON_VERSION), e.g. 0.2.81 or nightly-2026-10-28
+        type: string
+        required: true
+      nightly:
+        description: A nightly's "<date> <short sha>" (HORIZON_NIGHTLY), shown by the game; empty for a release
+        type: string
+        default: ''
+      trusted:
+        # Only release.yml says true: it builds main. A nightly can hold pull requests nobody reviewed yet, whose
+        # build scripts and tests run here and could rewrite target/, the cargo home or a compiler cache. So an
+        # untrusted build never runs on the release runner, never saves the Rust cache (its key is its own anyway),
+        # and a trusted one never reads the machine's shared sccache, which pull requests' jobs write
+        # (tests/test_nightly.py pins all of it).
+        description: The source is main (a release); false for anything else (a nightly)
+        type: boolean
+        default: false
+      developer_id:
+        description: Sign the macOS programs with Developer ID and notarize the zip (the runner's keychain)
+        type: boolean
+        default: true
+permissions:
+  contents: read
+jobs:
+  exporters:
+    # This runner holds the maintainer's own pinned Minecraft jars. Only our classes leave it. An untrusted build
+    # goes to the Mac mini runner that already runs pull requests' parity jobs (macOS + horizon-game:
+    # ludovics-mac-mini), never the release runner (MAC_RUNNER: ludovics-mac-mini-release) nor parity-main's.
+    runs-on: ${{ inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-game"]') }}
+    # Three full preparations (two isolated, one batched) besides the compile.
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref }}
+          persist-credentials: false
+          clean: true
+      - uses: dtolnay/rust-toolchain@stable
+      - run: bash tools/ci/runner-env.sh
+        env:
+          HORIZON_NO_SCCACHE: ${{ inputs.trusted && '1' || '' }}
+      - run: bash tools/ci/vanilla-data.sh
+      - name: Compile and validate original exporters against the pinned jars
+        shell: bash
+        run: |
+          set -euo pipefail
+          # target/ is gone after the clean checkout, and vanilla-data.sh builds the preparer only when it
+          # prepares afresh.
+          cargo build --release --locked -p horizon-prepare
+          # Compiled here, never taken from the runner's shared preparations: pull requests' parity jobs
+          # write those (vanilla-data.sh links .local/exporters to them).
+          rm -rf .local/exporters
+          bundle=$(target/release/horizon-prepare compile-exporters --root "$PWD" | tail -1)
+          mkdir -p exporters
+          cp -R "$bundle/server" "$bundle/client" "$bundle/manifest.json" exporters/
+          # Only our classes and their manifest leave this runner.
+          stray=$(find exporters -type f ! -path exporters/manifest.json \
+            ! \( -name '*.class' \( -path 'exporters/server/dev/horizonlab/parity/*' -o -path 'exporters/client/dev/horizonlab/parity/*' \) \))
+          [ -z "$stray" ] || { echo "::error::not one of our classes: $stray"; exit 1; }
+          python3 tools/check_prepare_exporters.py --binary target/release/horizon-prepare
+      - uses: actions/upload-artifact@v4
+        with:
+          name: original-exporters
+          path: exporters/
+          if-no-files-found: error
+          retention-days: 3
+
+  build:
+    needs: exporters
+    name: build ${{ matrix.name }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: linux
+            os: ubuntu-22.04
+            dir: horizon-linux-x86_64
+            asset: horizon-linux-x86_64.tar.gz
+            # The server build too: packaging/server/install.sh installs it on Linux.
+            server_dir: horizon-server-linux-x86_64
+            server_asset: horizon-server-linux-x86_64.tar.gz
+          - name: windows
+            os: windows-latest
+            dir: horizon-windows-x64
+            asset: horizon-windows-x64.zip
+            exe: .exe
+            # The C runtime linked in, so the game runs without the Visual C++ redistributable.
+            rustflags: -C target-feature=+crt-static
+          - name: macos
+            mac: true
+            dir: horizon-macos-arm64
+            asset: horizon-macos-arm64.zip
+    runs-on: ${{ matrix.mac && (inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-game"]')) || matrix.os }}
+    # Notarizing the zip can take a few minutes.
+    timeout-minutes: ${{ matrix.mac && 60 || 40 }}
+    env:
+      RUSTFLAGS: ${{ matrix.rustflags }}
+      # The release's version, built in (horizon_core::release): --version, user agents, crash reports and
+      # telemetry say it. No version-bump commits.
+      HORIZON_VERSION: ${{ inputs.version }}
+      # A nightly's date and commit ("2026-10-28 0c02067"), which the game shows; empty for a release.
+      HORIZON_NIGHTLY: ${{ inputs.nightly }}
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref }}
+          persist-credentials: false
+          # Always from a clean checkout, the Mac mini's runner too: its work folder is shared with pull requests'
+          # parity jobs, and nothing they leave (target/, an untracked .cargo/config.toml, a build script's output)
+          # may end up in a release. target/ is rebuilt from scratch; .local/ is relinked by vanilla-data.sh, which
+          # keeps its preparations outside the checkout.
+          clean: true
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+        if: runner.environment == 'github-hosted'
+        with:
+          # A release restores only what a release saved: an untrusted build has its own key and saves nothing.
+          shared-key: ${{ inputs.trusted && 'release' || 'nightly' }}-${{ matrix.name }}
+          save-if: ${{ inputs.trusted }}
+      - name: ALSA and udev headers
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
+      - name: Build the client, horizon-ctl, horizon-prepare and horizon-server
+        # `horizon-client/mods`: every released game runs code mods (the feature is off in dev builds).
+        run: cargo build --release --locked --features horizon-client/mods -p horizon-client --bin horizon-client --bin horizon-ctl -p horizon-prepare --bin horizon-prepare -p horizon-server --bin horizon-server
+      - name: Every program the release folder takes was built
+        run: |
+          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
+            test -f "target/release/$binary${{ matrix.exe }}" || { echo "::error::target/release/$binary${{ matrix.exe }} is missing"; exit 1; }
+          done
+      - name: The signing keychain, unlocked
+        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != '' && inputs.developer_id
+        env:
+          MACOS_SIGN_IDENTITY: ${{ vars.MACOS_SIGN_IDENTITY }}
+        run: packaging/macos/keychain.sh unlock
+      - name: Signed with Developer ID and the hardened runtime
+        # Before the checks below, so they run the programs as players will.
+        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != '' && inputs.developer_id
+        env:
+          MACOS_SIGN_IDENTITY: ${{ vars.MACOS_SIGN_IDENTITY }}
+        run: |
+          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
+            codesign --force --options runtime --timestamp --keychain "$MACOS_SIGN_KEYCHAIN" \
+              --identifier "dev.horizon.${binary#horizon-}" --sign "$MACOS_SIGN_IDENTITY" "target/release/$binary"
+            codesign --verify --strict --verbose=2 "target/release/$binary"
+          done
+      - name: Only system libraries
+        # Windows: no non-system DLL (a "DLL not found" dialog on some players' machines). Linux: the standard
+        # loader and libraries every desktop distribution has. macOS: only the system's own libraries.
+        run: |
+          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
+            file="target/release/$binary${{ matrix.exe }}"
+            if [[ "$RUNNER_OS" == macOS ]]; then
+              others=$(otool -L "$file" | tail -n +2 | awk '{print $1}' | grep -v -E '^(/usr/lib/|/System/Library/)' || true)
+              [[ -z "$others" ]] || { echo "::error::$binary links $others"; exit 1; }
+            else
+              ${{ runner.os == 'Windows' && 'python' || 'python3' }} tools/check_imports.py "$file"
+            fi
+          done
+      - name: Every program starts
+        run: |
+          set -euo pipefail
+          bin=target/release
+          "$bin/horizon-client${{ matrix.exe }}" --help | grep -q -- '--resources'
+          "$bin/horizon-ctl${{ matrix.exe }}" --help > /dev/null
+          "$bin/horizon-prepare${{ matrix.exe }}" --help | grep -q -- '--minecraft-dir'
+          # The version is the release's.
+          for binary in horizon-prepare horizon-server; do
+            out=$("$bin/$binary${{ matrix.exe }}" --version | tr -d '\r')
+            echo "$out"
+            [[ "$out" == "$binary $HORIZON_VERSION" ]] || { echo "::error::expected $binary $HORIZON_VERSION"; exit 1; }
+          done
+      - name: Tools from the runner
+        if: runner.environment == 'self-hosted'
+        env:
+          HORIZON_NO_SCCACHE: ${{ inputs.trusted && '1' || '' }}
+        run: bash tools/ci/runner-env.sh
+      - name: Resources prepared from the runner's own Minecraft
+        if: runner.environment == 'self-hosted'
+        run: bash tools/ci/vanilla-data.sh
+      - name: The game runs (offscreen, a new world, 1500 frames)
+        if: runner.environment == 'self-hosted'
+        run: |
+          set -euo pipefail
+          # From a scratch folder: the game keeps its saves and options in the folder it starts in.
+          home="$RUNNER_TEMP/horizon-smoke"
+          rm -rf "$home" && mkdir -p "$home"
+          version=$(sed -n 's/.*"version": *"\([^"]*\)".*/\1/p' research-lock.json | head -1)
+          client="$PWD/target/release/horizon-client"
+          resources="$PWD/.local/horizon-client/$version"
+          (cd "$home" && HORIZON_HOME="$home" HORIZON_NO_AUDIO=1 "$client" --resources "$resources" --offscreen \
+            --world smoke --seed 1 --render-distance 4 --world-frames 1500 --timeout-seconds 180 \
+            --smoke-report "$home/smoke.json" > "$home/client.log" 2>&1) || { tail -40 "$home/client.log"; exit 1; }
+          python3 - "$home/smoke.json" <<'EOF'
+          import json, sys
+          report = json.load(open(sys.argv[1]))
+          print(json.dumps(report))
+          if report.get("error") is not None or report.get("frames", 0) < 1500 or not report.get("chunks") \
+                  or not report.get("meshed_sections") or not report.get("player"):
+              sys.exit("the smoke run did not draw a world")
+          EOF
+          # Published with the release; the publish job checks it again before it publishes anything.
+          cp "$home/smoke.json" "$RUNNER_TEMP/smoke-test.json"
+      - uses: actions/upload-artifact@v4
+        if: runner.environment == 'self-hosted'
+        with:
+          name: smoke-test.json
+          path: ${{ runner.temp }}/smoke-test.json
+          if-no-files-found: error
+          retention-days: 3
+      - uses: actions/download-artifact@v4
+        with:
+          name: original-exporters
+          path: exporters
+      - name: Package
+        run: |
+          set -euo pipefail
+          cargo run --locked -p xtask -- package "target/release/horizon-client${{ matrix.exe }}" "dist/${{ matrix.dir }}"
+          cd dist
+          rm -f "${{ matrix.asset }}"
+          case "${{ matrix.asset }}" in
+            *.tar.gz) tar czf "${{ matrix.asset }}" "${{ matrix.dir }}" ;;
+            *) if [[ "$RUNNER_OS" == Windows ]]; then 7z a -tzip "${{ matrix.asset }}" "${{ matrix.dir }}" > /dev/null
+               else
+                 # Without resource forks and extended attributes: plain ditto adds an
+                 # AppleDouble `._` file beside every file that has any.
+                 ditto -c -k --norsrc --noextattr --noqtn --keepParent "${{ matrix.dir }}" "${{ matrix.asset }}"
+                 if unzip -Z1 "${{ matrix.asset }}" | grep -E '(^|/)(\._|__MACOSX/)'; then
+                   echo "::error::macOS metadata files in ${{ matrix.asset }}"; exit 1
+                 fi
+               fi ;;
+          esac
+          ls -l "${{ matrix.asset }}"
+      - name: Notarized
+        # A zip of programs can't be stapled: Gatekeeper asks Apple the first time each one runs.
+        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != '' && inputs.developer_id
+        run: |
+          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
+            codesign --verify --strict "dist/${{ matrix.dir }}/$binary"
+          done
+          packaging/macos/notarize.sh "dist/${{ matrix.asset }}"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.asset }}
+          path: dist/${{ matrix.asset }}
+          if-no-files-found: error
+          retention-days: 3
+      - name: The server build (the game without sound or controllers, as horizon-engine)
+        if: matrix.server_asset
+        run: |
+          set -euo pipefail
+          # After the client is packaged: target/release/horizon-client is rebuilt without the audio and
+          # controllers features, so it needs neither libasound nor libudev (minimal server images lack them),
+          # and with code mods like the client.
+          cargo build --release --locked -p horizon-client --no-default-features --features mods --bin horizon-client
+          cargo run --locked -p xtask -- package-server target/release/horizon-client "dist/${{ matrix.server_dir }}"
+          folder="dist/${{ matrix.server_dir }}"
+          python3 tools/check_imports.py --server "$folder/horizon-engine" "$folder/horizon-server" "$folder/horizon-prepare"
+          "$folder/horizon-engine" --help | grep -q -- '--resources'
+          [[ "$("$folder/horizon-server" --version)" == "horizon-server $HORIZON_VERSION" ]]
+          cd dist
+          rm -f "${{ matrix.server_asset }}"
+          tar czf "${{ matrix.server_asset }}" "${{ matrix.server_dir }}"
+          ls -l "${{ matrix.server_asset }}"
+      - uses: actions/upload-artifact@v4
+        if: matrix.server_asset
+        with:
+          name: ${{ matrix.server_asset }}
+          path: dist/${{ matrix.server_asset }}
+          if-no-files-found: error
+          retention-days: 3
+      - name: The signing keychain, locked again
+        if: always() && runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != '' && inputs.developer_id
+        run: packaging/macos/keychain.sh lock
+
@@ -0,0 +1,237 @@
+name: nightly build
+run-name: nightly build${{ inputs.request && format(' (request {0})', inputs.request) || '' }}
+# The opt-in Nightly channel (docs/release-flow.md "Nightly"; Ludovic, 2026-10-27). Once a night, and when a trusted
+# reviewer asks (`/nightly 2640 2642`, nightly-command.yml), it builds main plus the pull requests the reviewers
+# picked, merged in order (tools/ci/nightly_set.py). With none picked, it builds the newest union branch on origin
+# (union/<agent>-<name>: main plus pull requests the contribution gate proved together), or main when no union is
+# newer. It publishes the result as the `nightly` pre-release. Launchers install it only for players who turn Nightly
+# on. The previous nightly stays a week as nightly-<date>.
+#
+# Why the signing key never meets the pull requests' code:
+# - `pick` merges the picked heads onto main with `git merge-tree --write-tree`: git objects only, no working tree,
+#   so none of their files reaches the disk and no hook, filter or script of theirs runs. It refuses any pull
+#   request that changes a path CODEOWNERS gives to Ludovic (this folder, tools/ci/, the signing and update code),
+#   pushes the merge as nightly/build-<date>-<n> and saves the set on the nightly-state branch.
+# - This file, game-build.yml and every script below run from main's copy: a schedule runs the default branch, and
+#   `uses: ./…` takes the caller's commit. The union's own .github/ is never read.
+# - `build` (game-build.yml, `trusted: false`) never reaches a release's tools: its macOS jobs run on the runner
+#   that already runs pull requests' parity jobs, never the release runner; its Rust cache has its own key and is
+#   never saved; and releases don't read the machine's shared sccache.
+# - `build` (game-build.yml) checks out and compiles the merge (or the union) with no secrets: its token reads contents only and
+#   isn't kept in the checkout; the macOS programs are signed ad hoc (Developer ID needs the runner's keychain,
+#   which stays locked for nightlies).
+# - `sign` is the only job with RELEASE_SIGNING_KEY. It checks out nothing but main's tools/ci/sign_release.sh, which
+#   runs the runner's sha256sum and OpenSSL over the archives: it hashes them, never runs them. The signed message
+#   names the channel ("horizon release nightly"), so a nightly's signature can't pass for a release's.
+# - `publish` verifies the signature with main's horizon-release-sign, checks the smoke test, and only then moves
+#   the tag. Like sign, it never executes what build produced.
+#   gh workflow run "nightly build"                     # now (skips when the pick is the same commit as last night's)
+#   gh workflow run "nightly build" -f force=true       # build and publish even if unchanged
+#   gh workflow run "nightly build" -f dry_run=true     # build and sign with a throwaway key, publish nothing
+on:
+  schedule:
+    - cron: '17 20 * * *'  # 20:17 UTC: after the day's waves, before the 03:07 Paris parity audit takes the Mac mini
+  workflow_dispatch:
+    inputs:
+      force:
+        description: Build and publish even if tonight's pick is the commit already published
+        type: boolean
+        default: false
+      dry_run:
+        description: Build and sign with a throwaway key, publish nothing
+        type: boolean
+        default: false
+      issue:
+        description: The issue or pull request whose `/nightly` comment asked for this build (answered there)
+        type: string
+        default: ''
+      request:
+        description: The command's id, in the run's name so it can link the run
+        type: string
+        default: ''
+      prs:
+        description: A dry run's own set, `2640@<head> 2642@<head>` (the saved set stays)
+        type: string
+        default: ''
+permissions:
+  contents: read
+concurrency:
+  # One build at a time. A newer request replaces one still waiting: it builds the set as it is by then, so no pick
+  # is lost.
+  group: nightly-build
+  cancel-in-progress: false
+jobs:
+  pick:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: write       # nightly/build-<date>-<n> and the nightly-state branch (main is protected)
+      issues: write         # says in the thread when the picked pull requests conflict
+      pull-requests: write
+    outputs:
+      build: ${{ steps.pick.outputs.build }}
+      sha: ${{ steps.pick.outputs.sha }}
+      short: ${{ steps.pick.outputs.short }}
+      source: ${{ steps.pick.outputs.source }}
+      date: ${{ steps.pick.outputs.date }}
+      version: ${{ steps.pick.outputs.version }}
+      nightly: ${{ steps.pick.outputs.nightly }}
+      dry_run: ${{ steps.mode.outputs.dry_run }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - id: mode
+        # A dry run never publishes; a hand-started run off main is always one.
+        run: echo "dry_run=${{ github.event_name == 'workflow_dispatch' && (inputs.dry_run || github.ref != 'refs/heads/main') }}" >> "$GITHUB_OUTPUT"
+      - id: pick
+        env:
+          GH_TOKEN: ${{ github.token }}
+          FORCE: ${{ (inputs.force || steps.mode.outputs.dry_run == 'true') && 'yes' || '' }}
+          DRY_RUN: ${{ steps.mode.outputs.dry_run }}
+          NIGHTLY_ISSUE: ${{ inputs.issue }}
+          NIGHTLY_PRS: ${{ inputs.prs }}
+        run: |
+          python3 tools/ci/nightly.py pick ${FORCE:+--force} | tee -a "$GITHUB_STEP_SUMMARY"
+          { echo; cat nightly-notes.md; } >> "$GITHUB_STEP_SUMMARY"
+      - name: Old nightly/build-* branches deleted (scheduled runs only)
+        # Ludovic, 2026-10-27: older than 7 days, but never the newest build or one a published nightly points to;
+        # nothing but nightly/build-* (nightly.py stale_builds, tests/test_nightly.py).
+        if: github.event_name == 'schedule'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          { echo "### nightly/build-* branches"; python3 tools/ci/nightly.py prune-builds --days 7; } | tee -a "$GITHUB_STEP_SUMMARY"
+      - uses: actions/upload-artifact@v4
+        with:
+          name: nightly-notes
+          path: nightly-notes.md
+          retention-days: 3
+
+  build:
+    needs: pick
+    if: needs.pick.outputs.build == 'true'
+    uses: ./.github/workflows/game-build.yml
+    with:
+      ref: ${{ needs.pick.outputs.sha }}
+      version: ${{ needs.pick.outputs.version }}
+      nightly: ${{ needs.pick.outputs.nightly }}
+      developer_id: false
+      trusted: false  # it can hold unreviewed pull requests: their own cache key, never saved, not the release runner
+
+  sign:
+    needs: [pick, build]
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    # The key's only job: main's sign_release.sh hashes the archives and signs with the runner's OpenSSL.
+    environment: ${{ needs.pick.outputs.dry_run != 'true' && 'release' || '' }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          sparse-checkout: tools/ci/sign_release.sh
+          sparse-checkout-cone-mode: false
+          persist-credentials: false
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          pattern: horizon-*
+          merge-multiple: true
+      - name: Sign the checksums (SHA256SUMS, SHA256SUMS.sig) for the nightly channel
+        env:
+          RELEASE_SIGNING_KEY: ${{ secrets.RELEASE_SIGNING_KEY }}
+          RELEASE_SIGNING_KEY_NEXT: ${{ secrets.RELEASE_SIGNING_KEY_NEXT }}
+          EPHEMERAL: ${{ needs.pick.outputs.dry_run == 'true' && 'yes' || '' }}
+        run: |
+          bash tools/ci/sign_release.sh nightly dist/horizon-linux-x86_64.tar.gz dist/horizon-windows-x64.zip \
+            dist/horizon-macos-arm64.zip dist/horizon-server-linux-x86_64.tar.gz
+      - uses: actions/upload-artifact@v4
+        with:
+          name: signature
+          path: dist/SHA256SUMS*
+          if-no-files-found: error
+          retention-days: 3
+      - uses: actions/upload-artifact@v4
+        if: needs.pick.outputs.dry_run == 'true'
+        with:
+          name: ephemeral.pub
+          path: dist/ephemeral.pub
+          retention-days: 3
+
+  publish:
+    needs: [pick, build, sign]
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          merge-multiple: true
+      - name: The signature, checked as launchers check it
+        env:
+          EPHEMERAL: ${{ needs.pick.outputs.dry_run == 'true' && 'yes' || '' }}
+        run: |
+          key=(); [[ -n "$EPHEMERAL" ]] && key=(--key "$(cat dist/ephemeral.pub)")
+          cargo run --locked --quiet -p horizon-release-sign -- verify --tag nightly --publishing "${key[@]}" dist
+      - name: The smoke test drew a world
+        # No release-blocker check: a nightly is how blockers get tested.
+        run: python3 tools/release_train.py gate --kind game --smoke dist/smoke-test.json
+      - name: Publish as the `nightly` pre-release
+        if: needs.pick.outputs.dry_run != 'true'
+        env:
+          GH_TOKEN: ${{ github.token }}
+          SHA: ${{ needs.pick.outputs.sha }}
+          DATE: ${{ needs.pick.outputs.date }}
+        run: |
+          set -euo pipefail
+          python3 tools/ci/nightly.py rotate
+          signature=(); [[ -f dist/SHA256SUMS.sig ]] && signature=(dist/SHA256SUMS.sig)
+          # A pre-release, never GitHub's latest: launchers on the release channel never see it.
+          gh release create nightly --prerelease --latest=false --target "$SHA" \
+            --title "Nightly $DATE · ${SHA:0:7}" --notes-file dist/nightly-notes.md \
+            "dist/horizon-linux-x86_64.tar.gz#Nightly game files: Linux (horizon-linux-x86_64.tar.gz)" \
+            "dist/horizon-windows-x64.zip#Nightly game files: Windows (horizon-windows-x64.zip)" \
+            "dist/horizon-macos-arm64.zip#Nightly game files: macOS (horizon-macos-arm64.zip)" \
+            "dist/horizon-server-linux-x86_64.tar.gz#Nightly dedicated server for Linux (horizon-server-linux-x86_64.tar.gz)" \
+            dist/SHA256SUMS "${signature[@]}" dist/smoke-test.json
+          python3 tools/ci/nightly.py prune --days 7
+      - name: Dry run, the nightly that would be published
+        if: needs.pick.outputs.dry_run == 'true'
+        run: |
+          echo "Would publish nightly at ${{ needs.pick.outputs.sha }} (${{ needs.pick.outputs.source }})"
+          ls -l dist
+
+  answer:
+    # Tells the thread that asked for this build how it ended. A conflict `pick` already explained there.
+    needs: [pick, build, sign, publish]
+    if: always() && inputs.issue != '' && needs.pick.result == 'success'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - env:
+          GH_TOKEN: ${{ github.token }}
+          ISSUE: ${{ inputs.issue }}
+          BUILD: ${{ needs.pick.outputs.build }}
+          PUBLISHED: ${{ needs.publish.result }}
+          DRY_RUN: ${{ needs.pick.outputs.dry_run }}
+          NAME: Nightly ${{ needs.pick.outputs.date }} · ${{ needs.pick.outputs.short }}
+          RUN: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        run: |
+          if [[ "$BUILD" != true ]]; then
+            text="nothing new: the published Nightly is already this build."
+          elif [[ "$PUBLISHED" == success && "$DRY_RUN" == true ]]; then
+            text="the dry run built and signed $NAME; nothing was published. $RUN"
+          elif [[ "$PUBLISHED" == success ]]; then
+            text="published $NAME: https://github.com/$GITHUB_REPOSITORY/releases/tag/nightly. Launchers with Nightly on install it at their next start."
+          else
+            text="the build failed, nothing was published: $RUN"
+          fi
+          gh api "repos/$GITHUB_REPOSITORY/issues/$ISSUE/comments" -f body="🤖 Nightly: $text"
@@ -0,0 +1,46 @@
+name: nightly command
+# `/nightly …` comments: the trusted reviewers in .github/trusted-reviewers.txt (and Ludovic) pick the pull requests
+# the Nightly holds (docs/release-flow.md "Nightly channel", tools/ci/nightly_set.py). This job only checks who asked,
+# saves the set on the nightly-state branch, starts `nightly build` and answers in the thread.
+#
+# Why no pull request's code runs here, though the token can write:
+# - `issue_comment` always runs this file from main, whoever comments and wherever; a pull request's own copy of it
+#   is never read.
+# - It checks out main and runs main's nightly_set.py. The comment's text and author reach it as env vars, never in
+#   a shell line.
+# - It never checks out, fetches or merges a pull request: it reads their file lists through the API. The merge
+#   happens in nightly-build.yml's `pick`, with git objects only; their code runs in its `build`, without secrets.
+on:
+  issue_comment:
+    types: [created]
+permissions:
+  contents: read
+jobs:
+  command:
+    # Every other comment skips here, before a runner starts.
+    if: startsWith(github.event.comment.body, '/nightly') && github.event.comment.user.type != 'Bot'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      contents: write       # the nightly-state branch (main is protected)
+      actions: write        # starts `nightly build`
+      issues: write         # answers in the thread
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+          persist-credentials: false
+          sparse-checkout: |
+            .github/CODEOWNERS
+            .github/trusted-reviewers.txt
+            tools/ci/nightly_set.py
+          sparse-checkout-cone-mode: false
+      - name: Run the command
+        env:
+          GH_TOKEN: ${{ github.token }}
+          BODY: ${{ github.event.comment.body }}
+          AUTHOR: ${{ github.event.comment.user.login }}
+          ISSUE: ${{ github.event.issue.number }}
+          COMMENT_URL: ${{ github.event.comment.html_url }}
+        run: python3 tools/ci/nightly_set.py command
@@ -25,8 +25,8 @@ jobs:
  parity-main:
    # A Mac mini runner of its own (ludovics-mac-mini-2 holds only this label since 2026-10-26): behind PR parity jobs
    # this run waited 2 h while every merge replaced the pending one, and on the release runner a release then waited
-    # behind the next run. PR parity jobs have ludovics-mac-mini and the desktop. Not the desktop: a job slowed down
-    # because the maintainer came back could time out, and a failure here bisects and comments on merges.
+    # behind the next run. PR parity jobs have ludovics-mac-mini and playhorizon. Not playhorizon: its 4 CPUs
+    # make a core-crate run several times longer, and a failure here bisects and comments on merges.
    runs-on: [self-hosted, macOS, horizon-parity-main]
    timeout-minutes: 240  # a core-crate batch reruns ~300 harnesses (~60-90 min), a bisect a few rounds of the failures
    steps:
@@ -1,6 +1,6 @@
 name: parity
-# The vanilla harnesses a pull request's changes can affect, on the Mac mini's runner, which holds the maintainer's
-# own Minecraft files (Horizon never downloads the game). Called by ci.yml for pull requests from this repository
+# The vanilla harnesses a pull request's changes can affect, on the Mac mini's runner or playhorizon's, which hold the
+# maintainer's own Minecraft files (Horizon never downloads the game). Called by ci.yml for pull requests from this repository
 # and by run-parity.yml when a maintainer labels a fork's pull request run-parity. See docs/release-flow.md.
 on:
  workflow_call:
@@ -13,6 +13,13 @@ on:
        description: The commit to check out and test
        type: string
        required: true
+      full:
+        description: >-
+          The pull request carries the full-parity label (a change every harness reaches, such as a crate split): it
+          runs on playhorizon's runner only, so the Mac mini's runners stay free for the others. While that runner is
+          busy the job waits for it.
+        type: boolean
+        default: false
 permissions:
  contents: read
 env:
@@ -21,40 +28,53 @@ env:

 jobs:
  parity:
-    runs-on: [self-hosted, horizon-game]
-    timeout-minutes: 120  # a change to core crates reruns ~300 harnesses: ~60-90 min on the Mac mini
+    runs-on: ${{ inputs.full && fromJSON('["self-hosted", "horizon-game", "playhorizon"]') || fromJSON('["self-hosted", "horizon-game"]') }}
+    # A change to core crates reruns ~350 harnesses: ~60-90 min on the Mac mini; on playhorizon (4 of its 8 vCPUs, 4
+    # harnesses at a time) up to a few hours, and any pull request's job may land there.
+    timeout-minutes: ${{ inputs.full && 360 || 180 }}
    steps:
      - uses: actions/checkout@v4
        with:
-          # The commit the event names: a fork's later pushes need another run-parity label.
+          # The commit the event names: a fork's later pushes need another run-parity label. The next step merges
+          # main into it.
          ref: ${{ inputs.head }}
          fetch-depth: 0
          persist-credentials: false
          # Keeps .local/ (parity state, probe builds, oracle results) and target/ between runs.
          clean: false
+      - name: The head merged into main (what merging it would land)
+        id: merge
+        env:
+          BASE_SHA: ${{ inputs.base }}
+          HEAD_SHA: ${{ inputs.head }}
+        run: |
+          # Harness fixes and game fixes that reached main since the branch was made then apply here too: a head
+          # tested alone failed harnesses already fixed on main (server_knockback before #2114, mob_ai's heap before
+          # #2270, save_roundtrip before #2212). Selection then compares with this main, so it sees only the pull
+          # request's own changes. A head that conflicts with main is tested alone.
+          set -euo pipefail
+          git merge --abort 2>/dev/null || true
+          git fetch -q --no-tags origin +refs/heads/main:refs/remotes/origin/main
+          main=$(git rev-parse origin/main)
+          if git -c user.name=parity -c user.email=parity@localhost merge -q --no-edit --no-ff "$main" >/dev/null 2>&1; then
+            echo "base=$main" >> "$GITHUB_OUTPUT"
+            echo "Tested: head ${HEAD_SHA:0:9} merged into main ${main:0:9}" | tee -a "$GITHUB_STEP_SUMMARY"
+          else
+            git merge --abort
+            echo "base=$BASE_SHA" >> "$GITHUB_OUTPUT"
+            echo "::warning::head ${HEAD_SHA:0:9} conflicts with main ${main:0:9}: tested alone, without main's fixes"
+            echo "Tested: head ${HEAD_SHA:0:9} alone (it conflicts with main ${main:0:9})" | tee -a "$GITHUB_STEP_SUMMARY"
+          fi
      - uses: dtolnay/rust-toolchain@stable
      - name: Tools from the runner
        run: bash tools/ci/runner-env.sh
      - name: Vanilla data, and resources prepared by this preparer
-        env:
-          BASE_SHA: ${{ inputs.base }}
-        run: |
-          # main's script: one written before a fix to it left a real .local/horizon-client without sounds.json on
-          # the runner, and every later job there failed `subtitle`. A branch that changes the script runs its own.
-          set -euo pipefail
-          if git rev-parse --verify -q origin/main >/dev/null \
-            && git diff --quiet "$(git merge-base "$BASE_SHA" HEAD)" HEAD -- tools/ci/vanilla-data.sh; then
-            git show origin/main:tools/ci/vanilla-data.sh > "$RUNNER_TEMP/vanilla-data.sh"
-            bash "$RUNNER_TEMP/vanilla-data.sh"
-          else
-            bash tools/ci/vanilla-data.sh
-          fi
+        run: bash tools/ci/vanilla-data.sh
      - name: The prepared output is the one the preparer's OUTPUT_VERSION says
        env:
-          BASE_SHA: ${{ inputs.base }}
+          BASE_SHA: ${{ steps.merge.outputs.base }}
        run: |
-          # The job runs main's workflow on the head's files: a head made before OUTPUT_VERSION (#1947) has neither
-          # the tool nor the number, so there is nothing to check.
+          # A head made before OUTPUT_VERSION (#1947) that conflicts with main has neither the tool nor the number.
          if [ ! -f tools/prepare_output.py ] || ! grep -q OUTPUT_VERSION crates/horizon-prepare/src/lib.rs; then
            echo "This head's preparer has no OUTPUT_VERSION: nothing to check"
            exit 0
@@ -65,47 +85,8 @@ jobs:
      - name: The harnesses this change can affect
        env:
          PARITY_HOSTS: ''
-          BASE_SHA: ${{ inputs.base }}
-        run: |
-          # main's selection (tools/parity.py --changed --list with main's parity.py and parity_reach.py), so a
-          # branch made before a better selection landed gets it too; the head's own runner then runs those
-          # harnesses. A branch that changes the selection itself selects with its own code.
-          set -euo pipefail
-          own() { python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400; }  # world_spawn takes ~1480 s on a busy runner
-          fork_point=$(git merge-base "$BASE_SHA" HEAD)
-          if ! git rev-parse --verify -q origin/main >/dev/null || ! git diff --quiet "$fork_point" HEAD -- tools/parity.py tools/parity_reach.py; then
-            own
-            exit
-          fi
-          had_reach=$(git ls-files tools/parity_reach.py)
-          git show origin/main:tools/parity.py > tools/parity.py
-          git show origin/main:tools/parity_reach.py > tools/parity_reach.py
-          status=0
-          python3 tools/parity.py --changed "$BASE_SHA" --list > .local/parity-selection.txt || status=$?
-          git checkout -- tools/parity.py
-          if [ -n "$had_reach" ]; then git checkout -- tools/parity_reach.py; else rm -f tools/parity_reach.py; fi
-          cat .local/parity-selection.txt
-          if [ "$status" != 0 ]; then
-            echo "main's selection failed: the head's own selection runs"
-            own
-            exit
-          fi
-          names=$(sed '$d' .local/parity-selection.txt | grep -E '^[A-Za-z0-9_#]+$' || true)
-          # The summary line says how many would run: a count that doesn't match the names read (a format change)
-          # must not let the job pass untested.
-          expected=$(tail -1 .local/parity-selection.txt | sed -nE 's/^([0-9]+) of [0-9]+ harnesses would run$/\1/p')
-          count=$(printf '%s' "$names" | grep -c . || true)
-          if [ -z "$expected" ] || [ "$expected" != "$count" ]; then
-            echo "main's selection listed $count names, its summary says '${expected:-?}': the head's own selection runs"
-            own
-            exit
-          fi
-          if [ "$count" = 0 ]; then
-            echo "Nothing to run."
-            exit 0
-          fi
-          # shellcheck disable=SC2086
-          python3 tools/parity.py $names --timeout 2400
+          BASE_SHA: ${{ steps.merge.outputs.base }}
+        run: python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400  # world_spawn takes ~1480 s on a busy runner
      - name: Logs of the failed harnesses
        if: failure()
        uses: actions/upload-artifact@v4
@@ -40,7 +40,10 @@ permissions:
  # The open release-blocker issues (decide).
  issues: read
 concurrency:
-  group: game-release
+  # One release at a time. A hand-started dry run publishes nothing, so it can't race a real release: it gets a
+  # group of its own. In the shared group, a release queued behind it replaced it as the pending run and GitHub
+  # cancelled it (#2779's dry run, 2026-10-27), which happens all day while releases go out in batches.
+  group: game-release${{ github.event_name == 'workflow_dispatch' && inputs.dry_run && '-dry-run' || '' }}
  cancel-in-progress: false
 jobs:
  decide:
@@ -79,252 +82,15 @@ jobs:
          # A dry run builds whatever the decision, to test the builds.
          if [[ "${{ steps.mode.outputs.dry_run }}" == true ]]; then echo "release=true" >> "$GITHUB_OUTPUT"; fi

-  exporters:
+  build:
    needs: decide
    if: needs.decide.outputs.release == 'true'
-    # This runner holds the maintainer's own pinned Minecraft jars. Only our classes leave it.
-    runs-on: ${{ vars.MAC_RUNNER || 'ludovics-mac-mini' }}
-    # Three full preparations (two isolated, one batched) besides the compile.
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: ${{ needs.decide.outputs.head }}
-          persist-credentials: false
-          clean: true
-      - uses: dtolnay/rust-toolchain@stable
-      - run: bash tools/ci/runner-env.sh
-      - run: bash tools/ci/vanilla-data.sh
-      - name: Compile and validate original exporters against the pinned jars
-        shell: bash
-        run: |
-          set -euo pipefail
-          # target/ is gone after the clean checkout, and vanilla-data.sh builds the preparer only when it
-          # prepares afresh.
-          cargo build --release --locked -p horizon-prepare
-          # Compiled here, never taken from the runner's shared preparations: pull requests' parity jobs
-          # write those (vanilla-data.sh links .local/exporters to them).
-          rm -rf .local/exporters
-          bundle=$(target/release/horizon-prepare compile-exporters --root "$PWD" | tail -1)
-          mkdir -p exporters
-          cp -R "$bundle/server" "$bundle/client" "$bundle/manifest.json" exporters/
-          # Only our classes and their manifest leave this runner.
-          stray=$(find exporters -type f ! -path exporters/manifest.json \
-            ! \( -name '*.class' \( -path 'exporters/server/dev/horizonlab/parity/*' -o -path 'exporters/client/dev/horizonlab/parity/*' \) \))
-          [ -z "$stray" ] || { echo "::error::not one of our classes: $stray"; exit 1; }
-          python3 tools/check_prepare_exporters.py --binary target/release/horizon-prepare
-      - uses: actions/upload-artifact@v4
-        with:
-          name: original-exporters
-          path: exporters/
-          if-no-files-found: error
-          retention-days: 3
-
-  build:
-    needs: [decide, exporters]
-    if: needs.decide.outputs.release == 'true'
-    name: build ${{ matrix.name }}
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - name: linux
-            os: ubuntu-22.04
-            dir: horizon-linux-x86_64
-            asset: horizon-linux-x86_64.tar.gz
-            # The server build too: packaging/server/install.sh installs it on Linux.
-            server_dir: horizon-server-linux-x86_64
-            server_asset: horizon-server-linux-x86_64.tar.gz
-          - name: windows
-            os: windows-latest
-            dir: horizon-windows-x64
-            asset: horizon-windows-x64.zip
-            exe: .exe
-            # The C runtime linked in, so the game runs without the Visual C++ redistributable.
-            rustflags: -C target-feature=+crt-static
-          - name: macos
-            mac: true
-            dir: horizon-macos-arm64
-            asset: horizon-macos-arm64.zip
-    runs-on: ${{ matrix.mac && (vars.MAC_RUNNER || 'ludovics-mac-mini') || matrix.os }}
-    # Notarizing the zip can take a few minutes.
-    timeout-minutes: ${{ matrix.mac && 60 || 40 }}
-    env:
-      RUSTFLAGS: ${{ matrix.rustflags }}
-      # The release's version, built in (horizon_core::release): --version, user agents, crash reports and
-      # telemetry say it. No version-bump commits.
-      HORIZON_VERSION: ${{ needs.decide.outputs.version }}
-    defaults:
-      run:
-        shell: bash
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: ${{ needs.decide.outputs.head }}
-          persist-credentials: false
-          # Always from a clean checkout, the Mac mini's runner too: its work folder is shared with pull requests'
-          # parity jobs, and nothing they leave (target/, an untracked .cargo/config.toml, a build script's output)
-          # may end up in a release. target/ is rebuilt from scratch; .local/ is relinked by vanilla-data.sh, which
-          # keeps its preparations outside the checkout.
-          clean: true
-      - uses: dtolnay/rust-toolchain@stable
-      - uses: Swatinem/rust-cache@v2
-        if: runner.environment == 'github-hosted'
-        with:
-          shared-key: release-${{ matrix.name }}
-      - name: ALSA and udev headers
-        if: runner.os == 'Linux'
-        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
-      - name: Build the client, horizon-ctl, horizon-prepare and horizon-server
-        # `horizon-client/mods`: every released game runs code mods (the feature is off in dev builds).
-        run: cargo build --release --locked --features horizon-client/mods -p horizon-client --bin horizon-client --bin horizon-ctl -p horizon-prepare --bin horizon-prepare -p horizon-server --bin horizon-server
-      - name: Every program the release folder takes was built
-        run: |
-          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            test -f "target/release/$binary${{ matrix.exe }}" || { echo "::error::target/release/$binary${{ matrix.exe }} is missing"; exit 1; }
-          done
-      - name: The signing keychain, unlocked
-        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != ''
-        env:
-          MACOS_SIGN_IDENTITY: ${{ vars.MACOS_SIGN_IDENTITY }}
-        run: packaging/macos/keychain.sh unlock
-      - name: Signed with Developer ID and the hardened runtime
-        # Before the checks below, so they run the programs as players will.
-        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != ''
-        env:
-          MACOS_SIGN_IDENTITY: ${{ vars.MACOS_SIGN_IDENTITY }}
-        run: |
-          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            codesign --force --options runtime --timestamp --keychain "$MACOS_SIGN_KEYCHAIN" \
-              --identifier "dev.horizon.${binary#horizon-}" --sign "$MACOS_SIGN_IDENTITY" "target/release/$binary"
-            codesign --verify --strict --verbose=2 "target/release/$binary"
-          done
-      - name: Only system libraries
-        # Windows: no non-system DLL (a "DLL not found" dialog on some players' machines). Linux: the standard
-        # loader and libraries every desktop distribution has. macOS: only the system's own libraries.
-        run: |
-          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            file="target/release/$binary${{ matrix.exe }}"
-            if [[ "$RUNNER_OS" == macOS ]]; then
-              others=$(otool -L "$file" | tail -n +2 | awk '{print $1}' | grep -v -E '^(/usr/lib/|/System/Library/)' || true)
-              [[ -z "$others" ]] || { echo "::error::$binary links $others"; exit 1; }
-            else
-              ${{ runner.os == 'Windows' && 'python' || 'python3' }} tools/check_imports.py "$file"
-            fi
-          done
-      - name: Every program starts
-        run: |
-          set -euo pipefail
-          bin=target/release
-          "$bin/horizon-client${{ matrix.exe }}" --help | grep -q -- '--resources'
-          "$bin/horizon-ctl${{ matrix.exe }}" --help > /dev/null
-          "$bin/horizon-prepare${{ matrix.exe }}" --help | grep -q -- '--minecraft-dir'
-          # The version is the release's.
-          for binary in horizon-prepare horizon-server; do
-            out=$("$bin/$binary${{ matrix.exe }}" --version | tr -d '\r')
-            echo "$out"
-            [[ "$out" == "$binary $HORIZON_VERSION" ]] || { echo "::error::expected $binary $HORIZON_VERSION"; exit 1; }
-          done
-      - name: Tools from the runner
-        if: runner.environment == 'self-hosted'
-        run: bash tools/ci/runner-env.sh
-      - name: Resources prepared from the runner's own Minecraft
-        if: runner.environment == 'self-hosted'
-        run: bash tools/ci/vanilla-data.sh
-      - name: The game runs (offscreen, a new world, 1500 frames)
-        if: runner.environment == 'self-hosted'
-        run: |
-          set -euo pipefail
-          # From a scratch folder: the game keeps its saves and options in the folder it starts in.
-          home="$RUNNER_TEMP/horizon-smoke"
-          rm -rf "$home" && mkdir -p "$home"
-          version=$(sed -n 's/.*"version": *"\([^"]*\)".*/\1/p' research-lock.json | head -1)
-          client="$PWD/target/release/horizon-client"
-          resources="$PWD/.local/horizon-client/$version"
-          (cd "$home" && HORIZON_HOME="$home" HORIZON_NO_AUDIO=1 "$client" --resources "$resources" --offscreen \
-            --world smoke --seed 1 --render-distance 4 --world-frames 1500 --timeout-seconds 180 \
-            --smoke-report "$home/smoke.json" > "$home/client.log" 2>&1) || { tail -40 "$home/client.log"; exit 1; }
-          python3 - "$home/smoke.json" <<'EOF'
-          import json, sys
-          report = json.load(open(sys.argv[1]))
-          print(json.dumps(report))
-          if report.get("error") is not None or report.get("frames", 0) < 1500 or not report.get("chunks") \
-                  or not report.get("meshed_sections") or not report.get("player"):
-              sys.exit("the smoke run did not draw a world")
-          EOF
-          # Published with the release; the publish job checks it again before it publishes anything.
-          cp "$home/smoke.json" "$RUNNER_TEMP/smoke-test.json"
-      - uses: actions/upload-artifact@v4
-        if: runner.environment == 'self-hosted'
-        with:
-          name: smoke-test.json
-          path: ${{ runner.temp }}/smoke-test.json
-          if-no-files-found: error
-          retention-days: 3
-      - uses: actions/download-artifact@v4
-        with:
-          name: original-exporters
-          path: exporters
-      - name: Package
-        run: |
-          set -euo pipefail
-          cargo run --locked -p xtask -- package "target/release/horizon-client${{ matrix.exe }}" "dist/${{ matrix.dir }}"
-          cd dist
-          rm -f "${{ matrix.asset }}"
-          case "${{ matrix.asset }}" in
-            *.tar.gz) tar czf "${{ matrix.asset }}" "${{ matrix.dir }}" ;;
-            *) if [[ "$RUNNER_OS" == Windows ]]; then 7z a -tzip "${{ matrix.asset }}" "${{ matrix.dir }}" > /dev/null
-               else
-                 # Without resource forks and extended attributes: plain ditto adds an
-                 # AppleDouble `._` file beside every file that has any.
-                 ditto -c -k --norsrc --noextattr --noqtn --keepParent "${{ matrix.dir }}" "${{ matrix.asset }}"
-                 if unzip -Z1 "${{ matrix.asset }}" | grep -E '(^|/)(\._|__MACOSX/)'; then
-                   echo "::error::macOS metadata files in ${{ matrix.asset }}"; exit 1
-                 fi
-               fi ;;
-          esac
-          ls -l "${{ matrix.asset }}"
-      - name: Notarized
-        # A zip of programs can't be stapled: Gatekeeper asks Apple the first time each one runs.
-        if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != ''
-        run: |
-          for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            codesign --verify --strict "dist/${{ matrix.dir }}/$binary"
-          done
-          packaging/macos/notarize.sh "dist/${{ matrix.asset }}"
-      - uses: actions/upload-artifact@v4
-        with:
-          name: ${{ matrix.asset }}
-          path: dist/${{ matrix.asset }}
-          if-no-files-found: error
-          retention-days: 3
-      - name: The server build (the game without sound or controllers, as horizon-engine)
-        if: matrix.server_asset
-        run: |
-          set -euo pipefail
-          # After the client is packaged: target/release/horizon-client is rebuilt without the audio and
-          # controllers features, so it needs neither libasound nor libudev (minimal server images lack them),
-          # and with code mods like the client.
-          cargo build --release --locked -p horizon-client --no-default-features --features mods --bin horizon-client
-          cargo run --locked -p xtask -- package-server target/release/horizon-client "dist/${{ matrix.server_dir }}"
-          folder="dist/${{ matrix.server_dir }}"
-          python3 tools/check_imports.py --server "$folder/horizon-engine" "$folder/horizon-server" "$folder/horizon-prepare"
-          "$folder/horizon-engine" --help | grep -q -- '--resources'
-          [[ "$("$folder/horizon-server" --version)" == "horizon-server $HORIZON_VERSION" ]]
-          cd dist
-          rm -f "${{ matrix.server_asset }}"
-          tar czf "${{ matrix.server_asset }}" "${{ matrix.server_dir }}"
-          ls -l "${{ matrix.server_asset }}"
-      - uses: actions/upload-artifact@v4
-        if: matrix.server_asset
-        with:
-          name: ${{ matrix.server_asset }}
-          path: dist/${{ matrix.server_asset }}
-          if-no-files-found: error
-          retention-days: 3
-      - name: The signing keychain, locked again
-        if: always() && runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != ''
-        run: packaging/macos/keychain.sh lock
+    # Every platform's archive, and macOS's smoke test (game-build.yml).
+    uses: ./.github/workflows/game-build.yml
+    with:
+      ref: ${{ needs.decide.outputs.head }}
+      version: ${{ needs.decide.outputs.version }}
+      trusted: true  # main: the release runner, the release cache, no shared sccache

  sign:
    needs: [decide, build]
@@ -22,3 +22,4 @@ jobs:
    with:
      base: ${{ github.event.pull_request.base.sha }}
      head: ${{ github.event.pull_request.head.sha }}
+      full: ${{ contains(github.event.pull_request.labels.*.name, 'full-parity') }}
@@ -0,0 +1,48 @@
+name: triage command
+# `/close`, `/reopen`, `/label`, `/unlabel` comments: the trusted reviewers in .github/trusted-reviewers.txt (and
+# Ludovic) triage issues and pull requests without any repository role (docs/release-flow.md "Trusted reviewers",
+# tools/ci/triage_command.py).
+#
+# Why no pull request's code runs here, though the token can write:
+# - `issue_comment` always runs this file from main, whoever comments and wherever.
+# - It checks out main's script and list only, never a pull request; it reads threads through the API.
+# - The comment's text and author reach the script as env vars, never in a shell line. The token stays in the step.
+on:
+  issue_comment:
+    types: [created]
+permissions:
+  contents: read
+jobs:
+  command:
+    # Every other comment skips here, before a runner starts.
+    if: >-
+      github.event.comment.user.type != 'Bot' && (
+      startsWith(github.event.comment.body, '/close') ||
+      startsWith(github.event.comment.body, '/reopen') ||
+      startsWith(github.event.comment.body, '/label') ||
+      startsWith(github.event.comment.body, '/unlabel'))
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      contents: read
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+          persist-credentials: false
+          sparse-checkout: |
+            .github/trusted-reviewers.txt
+            tools/ci/nightly_set.py
+            tools/ci/triage_command.py
+          sparse-checkout-cone-mode: false
+      - name: Run the command
+        env:
+          GH_TOKEN: ${{ github.token }}
+          BODY: ${{ github.event.comment.body }}
+          AUTHOR: ${{ github.event.comment.user.login }}
+          ISSUE: ${{ github.event.issue.number }}
+          REPO: ${{ github.repository }}
+          COMMENT_URL: ${{ github.event.comment.html_url }}
+        run: python3 tools/ci/triage_command.py command
@@ -10,7 +10,8 @@ Feature → files → harness for the most-changed areas: [docs/architecture.md]
  `tools/check_public_tree.py` rejects them; `git config core.hooksPath .githooks` runs it on commit.
 - **Keep your runs away from real player data.** Any game or launcher you start gets fresh `mktemp -d`
  folders in `HORIZON_HOME` (the game's data), `HORIZON_LAUNCHER_HOME`, `XDG_DATA_HOME` and
-  `XDG_CONFIG_HOME`, plus `HORIZON_LAUNCHER_NO_SELF_UPDATE=1` and `HORIZON_NO_AUDIO=1`. Never write to
+  `XDG_CONFIG_HOME`, plus `HORIZON_LAUNCHER_NO_SELF_UPDATE=1` and `HORIZON_NO_AUDIO=1`, and, for the
+  launcher, `HORIZON_LAUNCHER_TRASH`, `HORIZON_LAUNCHER_CLIPBOARD` and `HORIZON_LAUNCHER_DESKTOP` pointing into the scratch home. Never write to
  `~/.local/share/{applications,horizon,horizon-launcher}` or `~/.local/bin`.
 - **Mark what an agent posts.** A PR body starts with a line naming whose agent opened it and with what.
  Ludovic's agents write `> 🤖 Opened by Ludovic's AI agent (Claude), not by Ludovic himself.`, and a
@@ -34,7 +35,10 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se

 | Crate | Owns |
 |---|---|
-| `horizon-client` | The game: a lib (`src/lib.rs`, ~190 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-client` | The game: a lib (`src/lib.rs`, ~170 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
+| `horizon-items` | Blocks and items below gameplay: `blocks.rs` (block facts), `items.rs`, `item_data.rs` (components), `enchant.rs`, `cooldowns.rs`, `bundle.rs`, `item_nbt.rs`. Re-exported as `horizon_client::items`... |
+| `horizon-command` | Command parsing (Brigadier): the vanilla tree, argument types, selectors, suggestions, the tree's network form. Re-exported as `horizon_client::command` |
+| `horizon-client-core` | The client lib's bottom layer: `text.rs`, `lang.rs`, `snbt.rs`, `nbt_path.rs`, `component.rs`, `scoreboard.rs`, `bossbar.rs`, `gamerules.rs`, `block_entity_nbt.rs`, registry/particle/sound tables. Re-exported under the old paths (`horizon_client::text`...) |
 | `horizon-world` | Vanilla world data with no gameplay loop: NBT, regions, chunks, `datafix/`, `worldgen/`, `level/` (server-side block behaviour, ticks, redstone), entity physics, items, effects, food, damage |
 | `horizon-core` | Simulation primitives: Java `Random`s, `jmath` (HotSpot-exact `Math`), positions, noise, density, paletted storage, `version.rs` (the pinned version) |
 | `horizon-protocol` | Network protocol 777: codecs, framing, encryption, `packets/{handshake,status,login,configuration,play}.rs`, `entity_data.rs` |
@@ -54,7 +58,8 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se

 Other top-level folders: `tools/` (harnesses and dev scripts), `tests/` (Python unit tests: `python3 -m
 unittest discover -s tests`), `mods/horizon/src/test/java/dev/horizonlab/parity/` (Java oracles),
-`website/` (playhorizon.dev; its paths are relative to `website/`), `docs/`, `.github/workflows/`.
+`docs/`, `.github/workflows/`. The website (playhorizon.dev) is the private horizon-rust/horizon-site: its build
+reads `README.md`, `launcher/links.json`, `docs/api/`, `roadmap/roadmap.json` and `crates/horizon-theme/tokens.css` from main.

 ## Build and test fast

@@ -62,6 +67,7 @@ unittest discover -s tests`), `mods/horizon/src/test/java/dev/horizonlab/parity/
 python3 tools/pr_ready.py                  # the self-check: fmt, clippy -D warnings, touched crates' tests, harnesses; paste its block in the PR
 python3 tools/pr_ready.py --quick          # same without harnesses
 cargo test -p horizon-client --lib --bins --tests   # skips the 104 examples (pr_ready does this); `--doc` separately
+cargo test -p horizon-client --features horizon-client/mods --lib mod_content::tests:: -- --ignored   # the 5 slow content-root tests, #[ignore]d; pr_ready runs them when mod content, assets, blocks or items change
 cargo build --profile fast -p horizon-client        # optimized, quick to link: use it to play or run lan_e2e
 python3 tools/parity.py --changed origin/main       # the harnesses your branch can affect (CI's parity job)
 python3 tools/parity.py --changed-files paths.txt --list   # which harnesses cover these files, without running them
@@ -115,18 +121,18 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 | Block behaviour | `crates/horizon-world/src/level/` (`mod.rs`, `tick.rs`, `hooks.rs`, `redstone.rs`, `place.rs`, `interact.rs`); game.rs `fn tick_blocks`, `fn process_level_events` |
 | Mobs | L: `mobs.rs` (types), `mobs/` (`ai.rs`, `goals.rs`, `brain.rs`, `*_brain.rs`, `nav.rs`, `path.rs`, `species.rs`, `spawning.rs`, `render.rs`, `anim.rs`); G: `creatures.rs` (ticking, spawning, mob events), one file per mob family (`dragon.rs`, `wither.rs`, `villagers.rs`, `piglins.rs`, `golems.rs`...), `natural_spawning.rs` |
 | Other entities | L: `entities.rs`, `projectiles.rs`, `arrows.rs`; G: `boats.rs`, `minecarts.rs`, `mounts.rs`, `armor_stands.rs`, `paintings.rs`, `frames.rs`, `fireworks.rs`, `tnt.rs`, `explosion.rs` |
-| Player actions | game.rs (`fn use_hand`, `fn use_item`, `fn attack`, `fn tick_mining`, `fn break_block`); G: `hand.rs`, `combat.rs`, `consume.rs`, `potions.rs`, `shield.rs`, `crossbow.rs`, `trident.rs`, `fishing.rs`; L: `motion.rs` + `motion/` (movement), `collisions.rs`, `items.rs`, `item_data.rs` |
+| Player actions | game.rs (`fn use_hand`, `fn use_item`, `fn attack`, `fn tick_mining`, `fn break_block`); G: `hand.rs`, `combat.rs`, `consume.rs`, `potions.rs`, `shield.rs`, `crossbow.rs`, `trident.rs`, `fishing.rs`; L: `motion.rs` + `motion/` (movement), `collisions.rs`; crate `horizon-items`: `items.rs`, `item_data.rs`, `enchant.rs`, `blocks.rs` |
 | Inventory and containers | L: `menu.rs` (`AbstractContainerMenu.clicked`), `container_screen.rs`, `containers.rs`, `creative.rs`, `crafting.rs`, `recipe_book*.rs`, `stations.rs`, `merchant.rs`; game.rs `fn menu_ops`, `fn click_inventory`; G: `stations.rs`, `trading.rs`, `recipe_book.rs`, `machines.rs` |
-| Commands | parse: L: `command/` (`args.rs`, `selector.rs`, `tree_*.rs`, `vanilla.rs`); run: G: `commands.rs` (dispatch) + `commands/*.rs` (`admin`, `execute`, `items`, `players`, `world_cmds`...); L: `scoreboard_cmd.rs`, `data_cmd.rs`, `nbt_path.rs`; G: `functions.rs`, `command_blocks.rs` |
+| Commands | parse: crate `horizon-command` (`args.rs`, `selector.rs`, `tree_*.rs`, `vanilla.rs`); run: G: `commands.rs` (dispatch) + `commands/*.rs` (`admin`, `execute`, `items`, `players`, `world_cmds`...); L: `scoreboard_cmd.rs`, `data_cmd.rs`; `horizon-client-core`: `nbt_path.rs`, `scoreboard.rs`; G: `functions.rs`, `command_blocks.rs` |
 | UI screens | `Screen` enum in game.rs; L: `title.rs` + `title/`, `options_ui.rs`, `multiplayer.rs`, `pack_screen.rs`, `graphics_ui.rs`, `screen_draw.rs`, `ui.rs` (widgets), `hud.rs`, `hud_layout.rs`, `hud_overlays.rs`, `chat.rs`, `tab_list.rs`; G: `startup_menu.rs`, `screens.rs` (pause, death), `options.rs`, `lan_screen.rs`, `chat.rs`, `sign_edit.rs`, `books.rs` |
 | Multiplayer client | L: `net.rs` (network thread); G: `remote.rs` (`fn handle_packet`, `fn tick_remote`), `remote_*.rs` (mob data, objects, projectiles, vehicles, stations) |
 | LAN host / server side | L: `lan/` (`conn.rs` handshake + login threads, `hub.rs` + `hub/` play state, `chunks.rs`, `entity.rs`, `tracking.rs`, `guest.rs`, `playerdata.rs`); G: `lan.rs` (`LanHost`), `lan_actions.rs` (`fn as_guest`, `fn tick_guests`), `lan_*.rs` per feature, `lan_entities.rs` (tracked entities) |
 | Integrated server | G: `integrated.rs` (the server thread), `levels.rs` (one level per dimension, `fn tick_server`), `server_travel.rs` |
 | Dedicated server | G: `dedicated.rs`, `dedicated/status.rs`; crates `horizon-server-files`, `horizon-server` |
-| Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `block_entity_nbt.rs`, `options_file.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
+| Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `options_file.rs`; `horizon-client-core/src/block_entity_nbt.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
 | Input | game.rs `fn window_event`, `fn key_pressed`, `fn play_mouse`; L: `keybinds.rs`, `keymapping.rs`, `key_names.rs`, `mouse.rs`, `input.rs`, `interaction_input.rs`, `gamepad.rs`, `osk.rs`, `clipboard.rs`; G: `pad.rs`, `pad_menu.rs` |
 | Audio | L: `audio.rs` (mixer), `sound_engine.rs`, `sound_events.rs`, `music.rs`, `ambience.rs`; G: `music.rs`, `subtitle_hud.rs` |
-| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`, `lang.rs`; crate `horizon-assets`; G: `packs.rs` |
+| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`; `horizon-client-core/src/lang.rs`; crate `horizon-assets`; G: `packs.rs` |
 | Agent control | L: `control.rs` (socket), `bin/horizon-ctl/`; G: `control.rs`, `agent.rs`, `events.rs`, `ui_control.rs` ([docs/agent-control.md](docs/agent-control.md)) |
 | Mods | crate `horizon-mods`; G: `mods.rs`; L: `mod_content.rs`, `mod_list.rs` |
 | Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs`, `tweaks.rs`, `options.rs` |
@@ -4,8 +4,8 @@ Thanks for helping. Horizon is Minecraft: Java Edition 26.3 rewritten in Rust, a
 everything is that **it plays exactly like vanilla**. This page is the short version of how we work; questions are
 welcome on [Discord](https://discord.gg/HcTeMZxe5E).

-This repository holds the game, the launcher and the website, plus the tools, tests and docs that build, check and
-release them. Anything else (videos, Discord and other community material) lives elsewhere.
+This repository holds the game and the launcher, plus the tools, tests and docs that build, check and release them.
+The website (playhorizon.dev) is built in a separate repository from this one's README, `docs/api/` and roadmap. Anything else (videos, Discord and other community material) lives elsewhere.

 **Where to start: [playhorizon.dev/hub](https://playhorizon.dev/hub).** It shows what is being done now and next
 ([ROADMAP.md](ROADMAP.md) in the repository), the work board, good first tasks, and the forms to report a bug or
@@ -98,5 +98,5 @@ new pushes, we add it again.

 ## Talk to us

-[Discord](https://discord.gg/HcTeMZxe5E) for questions and ideas, [issues](https://github.com/ludovic111/horizon/issues)
+[Discord](https://discord.gg/HcTeMZxe5E) for questions and ideas, [issues](https://github.com/horizon-rust/horizon/issues)
 for bugs. If you want to take something on, say so in its issue so nobody else starts the same work.
@@ -216,6 +216,13 @@ version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"

+[[package]]
+name = "beacons"
+version = "0.1.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.10.0"
@@ -923,6 +930,13 @@ version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b5343afd4a8365a643ac588dab4cf234a190c7f6c88c9f6dd6ffe00837661b7"

+[[package]]
+name = "far-view"
+version = "1.0.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "fdeflate"
 version = "0.3.7"
@@ -1365,10 +1379,13 @@ dependencies = [
 "glam",
 "horizon-assets",
 "horizon-bench",
+ "horizon-client-core",
+ "horizon-command",
 "horizon-core",
 "horizon-dualsense",
 "horizon-friends",
 "horizon-hdr",
+ "horizon-items",
 "horizon-mods",
 "horizon-protocol",
 "horizon-server-files",
@@ -1389,6 +1406,7 @@ dependencies = [
 "sha1",
 "sha2",
 "symphonia",
+ "unicode-bidi",
 "ureq",
 "wgpu",
 "winit",
@@ -1396,6 +1414,23 @@ dependencies = [
 "zip",
 ]

+[[package]]
+name = "horizon-client-core"
+version = "0.1.0"
+dependencies = [
+ "horizon-world",
+ "serde_json",
+]
+
+[[package]]
+name = "horizon-command"
+version = "0.1.0"
+dependencies = [
+ "horizon-client-core",
+ "horizon-protocol",
+ "horizon-world",
+]
+
 [[package]]
 name = "horizon-core"
 version = "0.1.0"
@@ -1435,6 +1470,17 @@ dependencies = [
 "wgpu",
 ]

+[[package]]
+name = "horizon-items"
+version = "0.1.0"
+dependencies = [
+ "horizon-client-core",
+ "horizon-core",
+ "horizon-world",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "horizon-mod-sdk"
 version = "0.1.0"
@@ -2971,6 +3017,13 @@ dependencies = [
 "objc2-quartz-core 0.3.2",
 ]

+[[package]]
+name = "recipes"
+version = "1.0.0"
+dependencies = [
+ "horizon-mod-sdk",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.4.1"
@@ -3734,6 +3787,12 @@ version = "1.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6f5e870be6c3b371b77fe0ee0bafb859fa4964b4404c27de1d380043c4dda20"

+[[package]]
+name = "unicode-bidi"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.26"
@@ -1,6 +1,47 @@
 [workspace]
 exclude = ["launcher", "crates/horizon-telemetry-server", "crates/horizon-mod-registry", "third_party/wgpu-hal"]
-members = ["crates/horizon-core", "crates/horizon-dualsense", "crates/horizon-threads", "crates/horizon-hdr", "crates/horizon-world", "crates/horizon-client", "crates/horizon-server-files", "crates/horizon-server", "crates/horizon-bots", "crates/horizon-assets", "crates/horizon-protocol", "crates/horizon-theme", "crates/horizon-prepare", "crates/horizon-telemetry", "crates/horizon-bench", "crates/horizon-friends", "crates/horizon-relay", "crates/horizon-mod-sdk", "crates/horizon-mods", "crates/horizon-mods/tests/guest", "crates/horizon-mods/tests/ui_guest", "crates/cargo-horizon-mod", "crates/horizon-port-pack", "crates/horizon-shaders", "crates/horizon-shader-api", "crates/horizon-release-sign", "crates/horizon-mod-sdk/examples/coords-hud", "crates/horizon-mod-sdk/examples/predator-missile", "crates/horizon-mod-sdk/examples/welcome", "mods/official/fps-overlay", "mods/official/keystrokes", "mods/official/minimap", "mods/official/zoom", "xtask"]
+members = [
+    "crates/horizon-core",
+    "crates/horizon-dualsense",
+    "crates/horizon-threads",
+    "crates/horizon-hdr",
+    "crates/horizon-world",
+    "crates/horizon-client",
+    "crates/horizon-client-core",
+    "crates/horizon-command",
+    "crates/horizon-items",
+    "crates/horizon-server-files",
+    "crates/horizon-server",
+    "crates/horizon-bots",
+    "crates/horizon-assets",
+    "crates/horizon-protocol",
+    "crates/horizon-theme",
+    "crates/horizon-prepare",
+    "crates/horizon-telemetry",
+    "crates/horizon-bench",
+    "crates/horizon-friends",
+    "crates/horizon-relay",
+    "crates/horizon-mod-sdk",
+    "crates/horizon-mods",
+    "crates/horizon-mods/tests/guest",
+    "crates/horizon-mods/tests/ui_guest",
+    "crates/cargo-horizon-mod",
+    "crates/horizon-port-pack",
+    "crates/horizon-shaders",
+    "crates/horizon-shader-api",
+    "crates/horizon-release-sign",
+    "crates/horizon-mod-sdk/examples/coords-hud",
+    "crates/horizon-mod-sdk/examples/predator-missile",
+    "crates/horizon-mod-sdk/examples/welcome",
+    "crates/horizon-mod-sdk/examples/beacons",
+    "mods/official/fps-overlay",
+    "mods/official/keystrokes",
+    "mods/official/far-view",
+    "mods/official/minimap",
+    "mods/official/zoom",
+    "xtask",
+    "mods/official/recipes",
+]
 resolver = "2"

 [workspace.package]
@@ -3,7 +3,7 @@
 </p>

 <p align="center">
-  <a href="https://github.com/ludovic111/horizon/actions/workflows/ci.yml"><img src="https://github.com/ludovic111/horizon/actions/workflows/ci.yml/badge.svg?branch=main" alt="CI"></a>
+  <a href="https://github.com/horizon-rust/horizon/actions/workflows/ci.yml"><img src="https://github.com/horizon-rust/horizon/actions/workflows/ci.yml/badge.svg?branch=main" alt="CI"></a>
  <img src="https://img.shields.io/badge/Minecraft-Java%2026.3-5D9C3F" alt="Minecraft Java 26.3">
  <img src="https://img.shields.io/badge/Rust-stable-B7410E?logo=rust&logoColor=white" alt="Rust">
  <img src="https://img.shields.io/badge/vanilla%20parity-100%25-F0795A" alt="Vanilla parity 100%">
@@ -15,7 +15,7 @@
  <a href="https://playhorizon.dev"><b>Website</b></a> ·
  <a href="#download"><b>Download</b></a> ·
  <a href="https://playhorizon.dev/docs/"><b>Documentation</b></a> ·
-  <a href="https://github.com/ludovic111/horizon/releases"><b>Release notes</b></a> ·
+  <a href="https://github.com/horizon-rust/horizon/releases"><b>Release notes</b></a> ·
  <a href="ROADMAP.md"><b>Roadmap</b></a> ·
  <a href="#project-status"><b>Project status</b></a> ·
  <a href="#contributing"><b>Contributing</b></a>
@@ -29,9 +29,9 @@ Horizon is Minecraft: Java Edition 26.3 rewritten in Rust: a native game that re

 ## Download

-Horizon is installed through **the Horizon launcher**. Get it from [playhorizon.dev](https://playhorizon.dev) (the Download button picks your system) or from [the launcher releases](https://github.com/ludovic111/horizon/releases?q=launcher-v&expanded=true), for Linux x86-64, macOS on Apple Silicon or Windows x64. The launcher installs and updates the game, prepares its files from your own copy of Minecraft, and updates itself.
+Horizon is installed through **the Horizon launcher**. Get it from [playhorizon.dev](https://playhorizon.dev) (the Download button picks your system) or from [the launcher releases](https://github.com/horizon-rust/horizon/releases?q=launcher-v&expanded=true), for Linux x86-64, macOS on Apple Silicon or Windows x64. The launcher installs and updates the game, prepares its files from your own copy of Minecraft, and updates itself.

-**You need** Minecraft: Java Edition 26.3, played once (the official launcher, Prism, MultiMC and other launchers all work); a Java 25 runtime, for the one-time preparation; and a GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac. Step by step, with macOS's first-open prompt and the first launch: [Install and first launch](https://playhorizon.dev/docs/install).
+**You need** a Microsoft account that owns Minecraft: Java Edition (the launcher signs in with it, as other launchers do; see [Microsoft account](docs/microsoft-account.md)); Minecraft: Java Edition 26.3, played once (the official launcher, Prism, MultiMC and other launchers all work); a Java 25 runtime, for the one-time preparation; and a GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac. Step by step, with macOS's first-open prompt and the first launch: [Install and first launch](https://playhorizon.dev/docs/install).

 <table>
  <tr>
@@ -47,7 +47,7 @@ The [documentation](https://playhorizon.dev/docs/) covers each of these.
 - **The game:** singleplayer with vanilla's world generation, mobs, villagers, raids, redstone, every command, the HUD and the recipe book, on saves in vanilla's format. Worlds from 1.8 to 26.2 are upgraded as vanilla does. [Status table](#project-status).
 - **Horizon's own extras:** new menus (vanilla's are one setting away), graphics presets, distant terrain up to 1024 chunks, controller support, optional zoom, minimap and more, all off by default where they would change the vanilla look. See [Settings](https://playhorizon.dev/docs/settings).
 - **Resource packs and data packs:** resource packs work, and data packs load functions, predicates and item modifiers.
- **Playing with others:** invite friends from the pause menu's Friends button with a code, Open to LAN, and joining offline-mode servers. Horizon cannot sign in to a Microsoft account yet, so it cannot join servers that check accounts. See [Multiplayer](https://playhorizon.dev/docs/multiplayer).
+- **Playing with others:** invite friends from the pause menu's Friends button with a code, Open to LAN, and joining servers, online-mode ones with the Microsoft account the launcher signs in with. See [Multiplayer](https://playhorizon.dev/docs/multiplayer).
 - **Mods:** Horizon has its own mod system (Rust compiled to WebAssembly). Java mod jars do not run. See [Mods and data packs](https://playhorizon.dev/docs/mods).

 Screenshots, captured in the Rust client itself with vanilla assets and no mods or shaders:
@@ -99,7 +99,7 @@ Horizon contains no game files and never downloads them. It builds its resources
 2. **Server jar:** the 26.3 server jar, from the `downloads.server.url` in your launcher's `versions/26.3/26.3.json` (or [minecraft.net/download/server](https://www.minecraft.net/en-us/download/server) while 26.3 is the current release). Pass it with `--server-jar` or set `HORIZON_SERVER_JAR`. It is only needed the first time.

 ```sh
-git clone https://github.com/ludovic111/horizon.git
+git clone https://github.com/horizon-rust/horizon.git
 cd horizon
 cargo run --release -p horizon-prepare -- --prepare --server-jar ~/Downloads/server.jar   # needs JDK 25
 cargo run --release -p horizon-prepare -- sounds   # optional: sounds from your launcher install
@@ -158,7 +158,7 @@ them too (Rust uses Java's own float maths on each platform).

 ### Known issues

-Horizon can't sign in to a Microsoft account yet, so it can't join online-mode servers (it joins offline-mode ones); skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; the creative hotbar keys (C/X) aren't wired to the hotbar loader; item tooltips lack attribute lines.
+Skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; the creative hotbar keys (C/X) aren't wired to the hotbar loader; item tooltips lack attribute lines.

 ## Licence

@@ -32,7 +32,7 @@ Making Horizon faster than vanilla on every computer, with smooth camera movemen

 <details><summary>Technical</summary>

-Frame pacing at render distance 32 ([#678](https://github.com/ludovic111/horizon/issues/678)): long frames come from work competing with the render thread. In review: world generation workers build free structure starts instead of queueing them ([#1760](https://github.com/ludovic111/horizon/issues/1760)), the worker pool leaves one core as vanilla does ([#1778](https://github.com/ludovic111/horizon/issues/1778)), and the terrain vertex arena is read as storage where flat draws run ([#1742](https://github.com/ludovic111/horizon/issues/1742)). Still open: far terrain at 48 to 64 chunks ([#718](https://github.com/ludovic111/horizon/issues/718)) and CPU-bound fields of block entities ([#717](https://github.com/ludovic111/horizon/issues/717)). Every change shows before and after numbers from `tools/perf_bench.py` against vanilla 26.3 ([docs/benchmark.md](docs/benchmark.md)).
+Frame pacing at render distance 32 ([#678](https://github.com/horizon-rust/horizon/issues/678)): long frames come from work competing with the render thread. In review: world generation workers build free structure starts instead of queueing them ([#1760](https://github.com/horizon-rust/horizon/issues/1760)), the worker pool leaves one core as vanilla does ([#1778](https://github.com/horizon-rust/horizon/issues/1778)), and the terrain vertex arena is read as storage where flat draws run ([#1742](https://github.com/horizon-rust/horizon/issues/1742)). Still open: far terrain at 48 to 64 chunks ([#718](https://github.com/horizon-rust/horizon/issues/718)) and CPU-bound fields of block entities ([#717](https://github.com/horizon-rust/horizon/issues/717)). Every change shows before and after numbers from `tools/perf_bench.py` against vanilla 26.3 ([docs/benchmark.md](docs/benchmark.md)).

 </details>

@@ -42,7 +42,7 @@ Speeding up the code that reads and writes the blocks of the world, which almost

 <details><summary>Technical</summary>

-`PalettedContainer` and `PackedStorage` find an entry's word by multiply and shift instead of an integer division ([#1790](https://github.com/ludovic111/horizon/issues/1790), [#1794](https://github.com/ludovic111/horizon/issues/1794)); meshing looks up baked models by index, not by name ([#1747](https://github.com/ludovic111/horizon/issues/1747)). Each change keeps the paletted storage harnesses identical and shows its microbenchmark ([docs/performance/paletted-container-access-results.md](docs/performance/paletted-container-access-results.md)).
+`PalettedContainer` and `PackedStorage` find an entry's word by multiply and shift instead of an integer division ([#1790](https://github.com/horizon-rust/horizon/issues/1790), [#1794](https://github.com/horizon-rust/horizon/issues/1794)); meshing looks up baked models by index, not by name ([#1747](https://github.com/horizon-rust/horizon/issues/1747)). Each change keeps the paletted storage harnesses identical and shows its microbenchmark ([docs/performance/paletted-container-access-results.md](docs/performance/paletted-container-access-results.md)).

 </details>

@@ -54,7 +54,7 @@ Making the world-generation mods of popular modpacks (new structures, YUNG's dun

 <details><summary>Technical</summary>

-`horizon-port-pack` carries a pack's data-driven content over; structure mods that need code get a native port: YUNG's worldgen as written ([#1746](https://github.com/ludovic111/horizon/issues/1746)), Lithostitched's limited and guaranteed elements with pool and processor modifiers ([#1777](https://github.com/ludovic111/horizon/issues/1777)), its processors as the game's own types ([#1765](https://github.com/ludovic111/horizon/issues/1765)). Proved by the structure blocks and layout harnesses ([#1753](https://github.com/ludovic111/horizon/issues/1753), [#1757](https://github.com/ludovic111/horizon/issues/1757)). Mods whose Java code does more than world generation don't run ([docs/modpacks.md](docs/modpacks.md)).
+`horizon-port-pack` carries a pack's data-driven content over; structure mods that need code get a native port: YUNG's worldgen as written ([#1746](https://github.com/horizon-rust/horizon/issues/1746)), Lithostitched's limited and guaranteed elements with pool and processor modifiers ([#1777](https://github.com/horizon-rust/horizon/issues/1777)), its processors as the game's own types ([#1765](https://github.com/horizon-rust/horizon/issues/1765)). Proved by the structure blocks and layout harnesses ([#1753](https://github.com/horizon-rust/horizon/issues/1753), [#1757](https://github.com/horizon-rust/horizon/issues/1757)). Mods whose Java code does more than world generation don't run ([docs/modpacks.md](docs/modpacks.md)).

 </details>

@@ -66,7 +66,7 @@ When you play on a server, other players, mobs, items and menus look and behave

 <details><summary>Technical</summary>

-Client-of-a-server fixes in `game/remote*.rs` and `horizon-protocol`: mobs' aggressive and item-use flags ([#1802](https://github.com/ludovic111/horizon/issues/1802), [#1798](https://github.com/ludovic111/horizon/issues/1798)), ghost items after a remote menu ([#1795](https://github.com/ludovic111/horizon/issues/1795)), skins ([#1652](https://github.com/ludovic111/horizon/issues/1652)), cookies and transfer packets for proxy networks ([#1650](https://github.com/ludovic111/horizon/issues/1650)), firework boosts ([#1671](https://github.com/ludovic111/horizon/issues/1671)), living-entity attributes and simulation distance ([#1731](https://github.com/ludovic111/horizon/issues/1731)), styled item names ([#1702](https://github.com/ludovic111/horizon/issues/1702)), primed TNT between updates ([#1710](https://github.com/ludovic111/horizon/issues/1710)).
+Client-of-a-server fixes in `game/remote*.rs` and `horizon-protocol`: mobs' aggressive and item-use flags ([#1802](https://github.com/horizon-rust/horizon/issues/1802), [#1798](https://github.com/horizon-rust/horizon/issues/1798)), ghost items after a remote menu ([#1795](https://github.com/horizon-rust/horizon/issues/1795)), skins ([#1652](https://github.com/horizon-rust/horizon/issues/1652)), cookies and transfer packets for proxy networks ([#1650](https://github.com/horizon-rust/horizon/issues/1650)), firework boosts ([#1671](https://github.com/horizon-rust/horizon/issues/1671)), living-entity attributes and simulation distance ([#1731](https://github.com/horizon-rust/horizon/issues/1731)), styled item names ([#1702](https://github.com/horizon-rust/horizon/issues/1702)), primed TNT between updates ([#1710](https://github.com/horizon-rust/horizon/issues/1710)).

 </details>

@@ -76,7 +76,7 @@ Servers that show dialogs, such as the register and login screens of AuthMe, wil

 <details><summary>Technical</summary>

-26.3's dialog packets and model ([#1720](https://github.com/ludovic111/horizon/issues/1720)), the dialog screen with its buttons and actions ([#1734](https://github.com/ludovic111/horizon/issues/1734)), then text and boolean inputs ([#1735](https://github.com/ludovic111/horizon/issues/1735)).
+26.3's dialog packets and model ([#1720](https://github.com/horizon-rust/horizon/issues/1720)), the dialog screen with its buttons and actions ([#1734](https://github.com/horizon-rust/horizon/issues/1734)), then text and boolean inputs ([#1735](https://github.com/horizon-rust/horizon/issues/1735)).

 </details>

@@ -86,7 +86,7 @@ A /pregen command that builds an area of the world ahead of time, so players don

 <details><summary>Technical</summary>

-Generates, lights and saves an area before anyone walks there ([#1805](https://github.com/ludovic111/horizon/issues/1805), a contributor's pull request, in review). Useful on servers, and it moves the generation cost away from the first visit; the generation speed-ups are under 'Steady frames at long render distances'.
+Generates, lights and saves an area before anyone walks there ([#1805](https://github.com/horizon-rust/horizon/issues/1805), a contributor's pull request, in review). Useful on servers, and it moves the generation cost away from the first visit; the generation speed-ups are under 'Steady frames at long render distances'.

 </details>

@@ -98,7 +98,7 @@ One place for mods, modpacks and resource packs made for Horizon: browse them on

 <details><summary>Technical</summary>

-Merged: the registry index (schema 1, `.hpack`, checks before install, [#1634](https://github.com/ludovic111/horizon/issues/1634)), `cargo horizon-mod check` ([#1642](https://github.com/ludovic111/horizon/issues/1642)) and the submission service (`crates/horizon-mod-registry`, [#1659](https://github.com/ludovic111/horizon/issues/1659)). In review: the website's /mods ([#1596](https://github.com/ludovic111/horizon/issues/1596)) and /mods/submit ([#1635](https://github.com/ludovic111/horizon/issues/1635)), and in the launcher the registry as a source ([#1636](https://github.com/ludovic111/horizon/issues/1636)), install, enable and takedowns ([#1637](https://github.com/ludovic111/horizon/issues/1637)), the Mods page ([#1638](https://github.com/ludovic111/horizon/issues/1638)) and modpacks as their own profiles ([#1640](https://github.com/ludovic111/horizon/issues/1640)).
+Merged: the registry index (schema 1, `.hpack`, checks before install, [#1634](https://github.com/horizon-rust/horizon/issues/1634)), `cargo horizon-mod check` ([#1642](https://github.com/horizon-rust/horizon/issues/1642)) and the submission service (`crates/horizon-mod-registry`, [#1659](https://github.com/horizon-rust/horizon/issues/1659)). In review: the website's /mods ([#1596](https://github.com/horizon-rust/horizon/issues/1596)) and /mods/submit ([#1635](https://github.com/horizon-rust/horizon/issues/1635)), and in the launcher the registry as a source ([#1636](https://github.com/horizon-rust/horizon/issues/1636)), install, enable and takedowns ([#1637](https://github.com/horizon-rust/horizon/issues/1637)), the Mods page ([#1638](https://github.com/horizon-rust/horizon/issues/1638)) and modpacks as their own profiles ([#1640](https://github.com/horizon-rust/horizon/issues/1640)).

 More: [docs/mods.md](docs/mods.md)

@@ -110,7 +110,7 @@ Mods that run on the server side of a world, so a dedicated server or a LAN worl

 <details><summary>Technical</summary>

-API 0.3, experimental first ([#1833](https://github.com/ludovic111/horizon/issues/1833), in review): the same sandboxed component runs on the server thread and the dedicated server, with world events (block broken or placed, entity spawned or killed, player joined or left), game rules and server commands with typed arguments. The world, item and entity interfaces come after (see 'Mods that read and change the world'). [docs/api/mods.md](docs/api/mods.md), [docs/mods.md](docs/mods.md).
+API 0.3, experimental first ([#1833](https://github.com/horizon-rust/horizon/issues/1833), in review): the same sandboxed component runs on the server thread and the dedicated server, with world events (block broken or placed, entity spawned or killed, player joined or left), game rules and server commands with typed arguments. The world, item and entity interfaces come after (see 'Mods that read and change the world'). [docs/api/mods.md](docs/api/mods.md), [docs/mods.md](docs/mods.md).

 </details>

@@ -120,7 +120,7 @@ Mods will be able to open their own screens and settings pages and react to keys

 <details><summary>Technical</summary>

-Capability `ui` is in review ([#1864](https://github.com/ludovic111/horizon/issues/1864)): mod-owned screens and a settings page under Options > Mods, built from vanilla's widgets. Still to design: `input` (an item's use, key binds, the crosshair target), `render` (a budgeted draw list on the native shader API) and `world` (changing blocks). Orbital Laser is the acceptance test: it needs all four today through its author's fork (see 'Orbital Laser on the normal game').
+Capability `ui` is in review ([#1864](https://github.com/horizon-rust/horizon/issues/1864)): mod-owned screens and a settings page under Options > Mods, built from vanilla's widgets. Still to design: `input` (an item's use, key binds, the crosshair target), `render` (a budgeted draw list on the native shader API) and `world` (changing blocks). Orbital Laser is the acceptance test: it needs all four today through its author's fork (see 'Orbital Laser on the normal game').

 More: [docs/mods.md](docs/mods.md)

@@ -132,9 +132,9 @@ Better tools for mod makers: a test runner that needs no game window, templates

 <details><summary>Technical</summary>

-`cargo horizon-mod test` runs a mod's test scripts against a fake game snapshot ([#1816](https://github.com/ludovic111/horizon/issues/1816)) and, for server mods, scripted server events ([#1837](https://github.com/ludovic111/horizon/issues/1837)); the content template and the guides are merged ([#1859](https://github.com/ludovic111/horizon/issues/1859), [#1810](https://github.com/ludovic111/horizon/issues/1810), [docs/api/stability.md](docs/api/stability.md)). Left: templates for hud, server and machine mods, typed wrappers in the SDK, a frozen 0.1 compatibility mod that every runtime must load, a CI check that fails when a stable reference entry is removed without a new major version, and the SDK on crates.io once the API is stable.
+`cargo horizon-mod test` runs a mod's test scripts against a fake game snapshot ([#1816](https://github.com/horizon-rust/horizon/issues/1816)) and, for server mods, scripted server events ([#1837](https://github.com/horizon-rust/horizon/issues/1837)); the content template and the guides are merged ([#1859](https://github.com/horizon-rust/horizon/issues/1859), [#1810](https://github.com/horizon-rust/horizon/issues/1810), [docs/api/stability.md](docs/api/stability.md)). Left: templates for hud, server and machine mods, typed wrappers in the SDK, a frozen 0.1 compatibility mod that every runtime must load, a CI check that fails when a stable reference entry is removed without a new major version, and the SDK on crates.io once the API is stable.

-More: [website/docs/test-a-mod.md](website/docs/test-a-mod.md)
+More: [https://playhorizon.dev/docs/test-a-mod](https://playhorizon.dev/docs/test-a-mod)

 </details>

@@ -146,7 +146,7 @@ Single player now runs a small server in the background, as vanilla does. We are

 <details><summary>Technical</summary>

-Since [#1514](https://github.com/ludovic111/horizon/issues/1514) single player runs on the server thread (`game/integrated.rs`) and the window joins it as a client; `--in-frame` keeps the old path. The open `[server-thread]` issues list the gaps. In review: a tool that changes a block ends the click ([#1797](https://github.com/ludovic111/horizon/issues/1797)), potions keep their potion over the connection ([#1796](https://github.com/ludovic111/horizon/issues/1796)), mobs' aggression and arm swings ([#1802](https://github.com/ludovic111/horizon/issues/1802)). [docs/server-levels.md](docs/server-levels.md).
+Since [#1514](https://github.com/horizon-rust/horizon/issues/1514) single player runs on the server thread (`game/integrated.rs`) and the window joins it as a client; `--in-frame` keeps the old path. The open `[server-thread]` issues list the gaps. In review: a tool that changes a block ends the click ([#1797](https://github.com/horizon-rust/horizon/issues/1797)), potions keep their potion over the connection ([#1796](https://github.com/horizon-rust/horizon/issues/1796)), mobs' aggression and arm swings ([#1802](https://github.com/horizon-rust/horizon/issues/1802)). [docs/server-levels.md](docs/server-levels.md).

 </details>

@@ -156,7 +156,7 @@ Item names, container titles and server messages follow the language you pick, a

 <details><summary>Technical</summary>

-Translatable components resolved through the selected language for items, containers and server text ([#1806](https://github.com/ludovic111/horizon/issues/1806)), on top of the bundled languages the prepared resources carry ([#1594](https://github.com/ludovic111/horizon/issues/1594)). Left: the client's own screens ([#1672](https://github.com/ludovic111/horizon/issues/1672)) and the main menu with zh_cn ([#1774](https://github.com/ludovic111/horizon/issues/1774)).
+Translatable components resolved through the selected language for items, containers and server text ([#1806](https://github.com/horizon-rust/horizon/issues/1806)), on top of the bundled languages the prepared resources carry ([#1594](https://github.com/horizon-rust/horizon/issues/1594)). Left: the client's own screens ([#1672](https://github.com/horizon-rust/horizon/issues/1672)) and the main menu with zh_cn ([#1774](https://github.com/horizon-rust/horizon/issues/1774)).

 </details>

@@ -166,9 +166,9 @@ After you throw an ender pearl, its slot should show the cooldown sweeping away,

 <details><summary>Technical</summary>

-Vanilla draws `ItemCooldowns`' percent as a white overlay over the slot (`GuiGraphicsExtractor.itemDecorations` and `itemCooldown`) in the hotbar and in inventories. Issue [#1763](https://github.com/ludovic111/horizon/issues/1763).
+Vanilla draws `ItemCooldowns`' percent as a white overlay over the slot (`GuiGraphicsExtractor.itemDecorations` and `itemCooldown`) in the hotbar and in inventories. Issue [#1763](https://github.com/horizon-rust/horizon/issues/1763).

-More: [#1933](https://github.com/ludovic111/horizon/issues/1933)
+More: [#1933](https://github.com/horizon-rust/horizon/issues/1933)

 </details>

@@ -178,9 +178,9 @@ The Hidden and Commands Only chat settings should hide chat, and team prefixes s

 <details><summary>Technical</summary>

-Vanilla checks `ChatVisiblity` before it delivers chat and system messages ([#1376](https://github.com/ludovic111/horizon/issues/1376)), and chat uses the team-formatted display name ([#1378](https://github.com/ludovic111/horizon/issues/1378)). Both issues have exact steps to reproduce.
+Vanilla checks `ChatVisiblity` before it delivers chat and system messages ([#1376](https://github.com/horizon-rust/horizon/issues/1376)), and chat uses the team-formatted display name ([#1378](https://github.com/horizon-rust/horizon/issues/1378)). Both issues have exact steps to reproduce.

-More: [#1932](https://github.com/ludovic111/horizon/issues/1932) · [#1841](https://github.com/ludovic111/horizon/issues/1841)
+More: [#1932](https://github.com/horizon-rust/horizon/issues/1932) · [#1841](https://github.com/horizon-rust/horizon/issues/1841)

 </details>

@@ -190,9 +190,9 @@ The mouse pointer should turn into a pointing hand over menu buttons, as in vani

 <details><summary>Technical</summary>

-26.3's `AbstractWidget` asks for a cursor from `CursorTypes` when it is hovered; winit's `CursorIcon::Pointer` gives the same shape. Issue [#1347](https://github.com/ludovic111/horizon/issues/1347).
+26.3's `AbstractWidget` asks for a cursor from `CursorTypes` when it is hovered; winit's `CursorIcon::Pointer` gives the same shape. Issue [#1347](https://github.com/horizon-rust/horizon/issues/1347).

-More: [#1897](https://github.com/ludovic111/horizon/issues/1897)
+More: [#1897](https://github.com/horizon-rust/horizon/issues/1897)

 </details>

@@ -202,9 +202,9 @@ Ctrl+Backspace should delete a whole word in the creative search, and every list

 <details><summary>Technical</summary>

-`EditBox` deletes by word with Ctrl ([#1764](https://github.com/ludovic111/horizon/issues/1764)); the Game Rules and Statistics lists' scroll bars can't be dragged ([#1782](https://github.com/ludovic111/horizon/issues/1782), after [#978](https://github.com/ludovic111/horizon/issues/978)).
+`EditBox` deletes by word with Ctrl ([#1764](https://github.com/horizon-rust/horizon/issues/1764)); the Game Rules and Statistics lists' scroll bars can't be dragged ([#1782](https://github.com/horizon-rust/horizon/issues/1782), after [#978](https://github.com/horizon-rust/horizon/issues/978)).

-More: [#1884](https://github.com/ludovic111/horizon/issues/1884) · [#1931](https://github.com/ludovic111/horizon/issues/1931)
+More: [#1884](https://github.com/horizon-rust/horizon/issues/1884) · [#1931](https://github.com/horizon-rust/horizon/issues/1931)

 </details>

@@ -214,9 +214,9 @@ Chickens should flap their wings while they fall, not stand still in the air.

 <details><summary>Technical</summary>

-Vanilla's `Chicken.aiStep` updates `flap` and `flapSpeed` when the chicken isn't on the ground, and the model's wings follow them. Issue [#1706](https://github.com/ludovic111/horizon/issues/1706).
+Vanilla's `Chicken.aiStep` updates `flap` and `flapSpeed` when the chicken isn't on the ground, and the model's wings follow them. Issue [#1706](https://github.com/horizon-rust/horizon/issues/1706).

-More: [#1892](https://github.com/ludovic111/horizon/issues/1892)
+More: [#1892](https://github.com/horizon-rust/horizon/issues/1892)

 </details>

@@ -228,9 +228,9 @@ Shader packs were removed and are being rebuilt from scratch. They come back, of

 <details><summary>Technical</summary>

-A clean-room rewrite in `horizon-shaderpack`, from the packs' public format documentation only: reading packs, the preprocessor and `.properties` files are merged ([#1584](https://github.com/ludovic111/horizon/issues/1584), [#1585](https://github.com/ludovic111/horizon/issues/1585), [#1586](https://github.com/ludovic111/horizon/issues/1586)); translating programs to WGSL through naga, buffers, uniforms and the terrain, entity, sky, weather and hand stages are in review ([#1698](https://github.com/ludovic111/horizon/issues/1698) to [#1801](https://github.com/ludovic111/horizon/issues/1801)).
+A clean-room rewrite in `horizon-shaderpack`, from the packs' public format documentation only: reading packs, the preprocessor and `.properties` files are merged ([#1584](https://github.com/horizon-rust/horizon/issues/1584), [#1585](https://github.com/horizon-rust/horizon/issues/1585), [#1586](https://github.com/horizon-rust/horizon/issues/1586)); translating programs to WGSL through naga, buffers, uniforms and the terrain, entity, sky, weather and hand stages are in review ([#1698](https://github.com/horizon-rust/horizon/issues/1698) to [#1801](https://github.com/horizon-rust/horizon/issues/1801)).

-More: [#1561](https://github.com/ludovic111/horizon/issues/1561) · [#1771](https://github.com/ludovic111/horizon/issues/1771) · [#1786](https://github.com/ludovic111/horizon/issues/1786)
+More: [#1561](https://github.com/horizon-rust/horizon/issues/1561) · [#1771](https://github.com/horizon-rust/horizon/issues/1771) · [#1786](https://github.com/horizon-rust/horizon/issues/1786)

 </details>

@@ -240,7 +240,7 @@ Horizon's own way to make shader packs, with tools to write and test them. Every

 <details><summary>Technical</summary>

-`horizon-shader-api` (API 0.1, experimental): WGSL stages with typed inputs inside the renderer's passes, options as WGSL override constants, and the `horizon-shader new|check|pack` tool with templates and the example pack Golden Hour. Merged: the check every pack passes ([#1820](https://github.com/ludovic111/horizon/issues/1820)) and the tool, templates and guide ([#1822](https://github.com/ludovic111/horizon/issues/1822)). In review: the post stage running in the game with hot reload ([#1861](https://github.com/ludovic111/horizon/issues/1861)), the sky stage ([#1863](https://github.com/ludovic111/horizon/issues/1863)) and registry checks that use the game's own check ([#1855](https://github.com/ludovic111/horizon/issues/1855)). Left: the material, lighting and shadow stages, a last-good fallback on reload, a GPU-time overlay per stage and budgets ([docs/shaders.md](docs/shaders.md), [docs/api/shaders.md](docs/api/shaders.md)). The Iris/OptiFine loader is a separate item, 'Shader packs, written again from scratch'.
+`horizon-shader-api` (API 0.1, experimental): WGSL stages with typed inputs inside the renderer's passes, options as WGSL override constants, and the `horizon-shader new|check|pack` tool with templates and the example pack Golden Hour. Merged: the check every pack passes ([#1820](https://github.com/horizon-rust/horizon/issues/1820)) and the tool, templates and guide ([#1822](https://github.com/horizon-rust/horizon/issues/1822)). In review: the post stage running in the game with hot reload ([#1861](https://github.com/horizon-rust/horizon/issues/1861)), the sky stage ([#1863](https://github.com/horizon-rust/horizon/issues/1863)) and registry checks that use the game's own check ([#1855](https://github.com/horizon-rust/horizon/issues/1855)). Left: the material, lighting and shadow stages, a last-good fallback on reload, a GPU-time overlay per stage and budgets ([docs/shaders.md](docs/shaders.md), [docs/api/shaders.md](docs/api/shaders.md)). The Iris/OptiFine loader is a separate item, 'Shader packs, written again from scratch'.

 </details>

@@ -252,7 +252,7 @@ Your Discord profile can show that you are playing Horizon, with a switch to tur

 <details><summary>Technical</summary>

-A Discord IPC client on its own thread ([#1787](https://github.com/ludovic111/horizon/issues/1787)) and the presence with its setting ([#1788](https://github.com/ludovic111/horizon/issues/1788)). Merged: it ships with the next release.
+A Discord IPC client on its own thread ([#1787](https://github.com/horizon-rust/horizon/issues/1787)) and the presence with its setting ([#1788](https://github.com/horizon-rust/horizon/issues/1788)). Merged: it ships with the next release.

 </details>

@@ -264,7 +264,7 @@ Cleaning up Horizon's code: removing what nothing uses and making it quicker to

 <details><summary>Technical</summary>

-A review of the whole tree: dead code and stubs removed ([#1432](https://github.com/ludovic111/horizon/issues/1432), [#1658](https://github.com/ludovic111/horizon/issues/1658)), one probe binary per crate ([#1453](https://github.com/ludovic111/horizon/issues/1453), [#1454](https://github.com/ludovic111/horizon/issues/1454)), shared harness helpers ([#1448](https://github.com/ludovic111/horizon/issues/1448)), clippy clean on the whole tree ([#1707](https://github.com/ludovic111/horizon/issues/1707)). [docs/architecture.md](docs/architecture.md) maps each feature to its files and harnesses.
+A review of the whole tree: dead code and stubs removed ([#1432](https://github.com/horizon-rust/horizon/issues/1432), [#1658](https://github.com/horizon-rust/horizon/issues/1658)), one probe binary per crate ([#1453](https://github.com/horizon-rust/horizon/issues/1453), [#1454](https://github.com/horizon-rust/horizon/issues/1454)), shared harness helpers ([#1448](https://github.com/horizon-rust/horizon/issues/1448)), clippy clean on the whole tree ([#1707](https://github.com/horizon-rust/horizon/issues/1707)). [docs/architecture.md](docs/architecture.md) maps each feature to its files and harnesses.

 </details>

@@ -278,7 +278,7 @@ New public numbers comparing Horizon with vanilla on many kinds of computers, me

 <details><summary>Technical</summary>

-Redo the comparison after the current performance work ([#1073](https://github.com/ludovic111/horizon/issues/1073)); reliability, coverage and presentation ([#1346](https://github.com/ludovic111/horizon/issues/1346)); a scene must count as loaded only once its first chunk arrives ([#1749](https://github.com/ludovic111/horizon/issues/1749)). Next: a performance history across releases (an automatic comparison of each release with the last, on a timeline), more report fields (server TPS and MSPT, power, battery drain, temperature, throttling) and more hardware (a MacBook on battery, low-end laptops, community reports). Players' reports come in through `--benchmark` and `horizon-launcher data benchmark` ([docs/benchmark.md](docs/benchmark.md)).
+Redo the comparison after the current performance work ([#1073](https://github.com/horizon-rust/horizon/issues/1073)); reliability, coverage and presentation ([#1346](https://github.com/horizon-rust/horizon/issues/1346)); a scene must count as loaded only once its first chunk arrives ([#1749](https://github.com/horizon-rust/horizon/issues/1749)). Next: a performance history across releases (an automatic comparison of each release with the last, on a timeline), more report fields (server TPS and MSPT, power, battery drain, temperature, throttling) and more hardware (a MacBook on battery, low-end laptops, community reports). Players' reports come in through `--benchmark` and `horizon-launcher data benchmark` ([docs/benchmark.md](docs/benchmark.md)).

 </details>

@@ -288,7 +288,7 @@ Creating a world and joining it should be quick even on a four-thread laptop, wh

 <details><summary>Technical</summary>

-Cut the per-column generation cost (noise sampling, surface rules, aquifers) and the lock convoy on structure starts, and leave one core free for the rest of the game as vanilla does ([#1760](https://github.com/ludovic111/horizon/issues/1760) and [#1778](https://github.com/ludovic111/horizon/issues/1778), in review, are listed under 'Steady frames at long render distances'). Still to profile on small CPUs: the first seconds of a fresh world deliver no chunk, and fluids remesh for about a minute after loading. Measured with `tools/perf_bench.py` ([docs/benchmark.md](docs/benchmark.md), [docs/profiling.md](docs/profiling.md)).
+Cut the per-column generation cost (noise sampling, surface rules, aquifers) and the lock convoy on structure starts, and leave one core free for the rest of the game as vanilla does ([#1760](https://github.com/horizon-rust/horizon/issues/1760) and [#1778](https://github.com/horizon-rust/horizon/issues/1778), in review, are listed under 'Steady frames at long render distances'). Still to profile on small CPUs: the first seconds of a fresh world deliver no chunk, and fluids remesh for about a minute after loading. Measured with `tools/perf_bench.py` ([docs/benchmark.md](docs/benchmark.md), [docs/profiling.md](docs/profiling.md)).

 </details>

@@ -310,7 +310,7 @@ Horizon should run well on small machines: integrated graphics, the Steam Deck,

 Partly done: an opt-in 60 FPS cap with fewer workers on battery, Far Detail Reduced for integrated GPUs and animated textures on the GPU (both shipped). Left: measured targets and fixes per class of machine (memory use, worker counts, startup) on a Steam Deck, old Intel and Apple Silicon Macs and 8 GB computers, reported on the Benchmarks page.

-More: [docs/benchmark.md](docs/benchmark.md) · [website/docs/performance.md](website/docs/performance.md)
+More: [docs/benchmark.md](docs/benchmark.md) · [https://playhorizon.dev/docs/performance](https://playhorizon.dev/docs/performance)

 </details>

@@ -320,7 +320,7 @@ Draw the game at a lower resolution and sharpen it to your screen's size, in the

 <details><summary>Technical</summary>

-A render-scale setting below the window size with an upscaler of our own that runs on every wgpu backend. Proof: frame time against native resolution on integrated GPUs, and screenshots for image quality. Issue [#1403](https://github.com/ludovic111/horizon/issues/1403).
+A render-scale setting below the window size with an upscaler of our own that runs on every wgpu backend. Proof: frame time against native resolution on integrated GPUs, and screenshots for image quality. Issue [#1403](https://github.com/horizon-rust/horizon/issues/1403).

 </details>

@@ -330,7 +330,7 @@ Several smaller speed-ups, each measured: idle block entities that sleep, cheape

 <details><summary>Technical</summary>

-Block entities and hoppers that skip work when idle (the hopper item scan is already skipped when no item is near); a particle frustum test first (also a parity gap), then particle quads built on the GPU; jigsaw shortcuts that skip blocked connectors and pool elements known not to fit, with layouts unchanged (trial chambers and ancient cities first); batched raw mouse input on Windows for 8000 Hz mice; a better atlas packer for huge resource packs (a 64x pack builds a 704 MiB atlas for 452 MiB of textures); sign-heavy scenes ([#1461](https://github.com/ludovic111/horizon/issues/1461)). Profile first, keep what pays, show before and after numbers.
+Block entities and hoppers that skip work when idle (the hopper item scan is already skipped when no item is near); a particle frustum test first (also a parity gap), then particle quads built on the GPU; jigsaw shortcuts that skip blocked connectors and pool elements known not to fit, with layouts unchanged (trial chambers and ancient cities first); batched raw mouse input on Windows for 8000 Hz mice; a better atlas packer for huge resource packs (a 64x pack builds a 704 MiB atlas for 452 MiB of textures); sign-heavy scenes ([#1461](https://github.com/horizon-rust/horizon/issues/1461)). Profile first, keep what pays, show before and after numbers.

 More: [docs/profiling.md](docs/profiling.md)

@@ -364,7 +364,7 @@ Making mods that add machines, magic and mobs work in Horizon, in steps, startin

 <details><summary>Technical</summary>

-333 of the 496 mods in a big pack (ATM10) contain code. Issue [#1854](https://github.com/ludovic111/horizon/issues/1854) ranks the API gaps (ticking block entities, networking, rendering, menus, inventories) that unlock them in tiers, with machines first as the recommended path and a furnace ported tick for tick as proof. The first API step is a draft ([#1189](https://github.com/ludovic111/horizon/issues/1189), see 'Machines and blocks with inventories'). The path isn't started yet ([docs/modpacks.md](docs/modpacks.md)).
+333 of the 496 mods in a big pack (ATM10) contain code. Issue [#1854](https://github.com/horizon-rust/horizon/issues/1854) ranks the API gaps (ticking block entities, networking, rendering, menus, inventories) that unlock them in tiers, with machines first as the recommended path and a furnace ported tick for tick as proof. The first API step is a draft ([#1189](https://github.com/horizon-rust/horizon/issues/1189), see 'Machines and blocks with inventories'). The path isn't started yet ([docs/modpacks.md](docs/modpacks.md)).

 </details>

@@ -386,7 +386,7 @@ Set up Horizon, a server first, without Java on your computer: published tables

 <details><summary>Technical</summary>

-Today `horizon-prepare` runs Mojang's exporters with Java. Issue [#1750](https://github.com/ludovic111/horizon/issues/1750) proposes publishing the computed version tables once from CI and assembling the rest locally from the player's own jar and assets, provided the tables hold no Mojang content; a contributor offered a pull request, and it would help phones too. A server-only prepare from `server.jar` alone is the first step ([docs/server.md](docs/server.md)).
+Today `horizon-prepare` runs Mojang's exporters with Java. Issue [#1750](https://github.com/horizon-rust/horizon/issues/1750) proposes publishing the computed version tables once from CI and assembling the rest locally from the player's own jar and assets, provided the tables hold no Mojang content; a contributor offered a pull request, and it would help phones too. A server-only prepare from `server.jar` alone is the first step ([docs/server.md](docs/server.md)).

 </details>

@@ -406,7 +406,7 @@ Smoother hosting: a real Windows service, a backup before every update, backups

 <details><summary>Technical</summary>

-A Windows service wrapper instead of the logon scheduled task; `backups.before_update`; hot reload of config for view distance and the message of the day (needs engine support); backups that keep world and player state ([#1808](https://github.com/ludovic111/horizon/issues/1808), a contributor's draft, in review). [docs/hosting.md](docs/hosting.md), docs/server.md.
+A Windows service wrapper instead of the logon scheduled task; `backups.before_update`; hot reload of config for view distance and the message of the day (needs engine support); backups that keep world and player state ([#1808](https://github.com/horizon-rust/horizon/issues/1808), a contributor's draft, in review). [docs/hosting.md](docs/hosting.md), docs/server.md.

 </details>

@@ -464,7 +464,7 @@ Mods that add machines: blocks that tick, hold items and have their own menus. T

 <details><summary>Technical</summary>

-Block entities and menus: ticking machines with slots, server menu logic and the menu protocol to clients, energy, item and fluid transfer, data attachments, accessory slots and custom recipe types, with a typed client and server channel and typed config beside them. A draft ([#1189](https://github.com/ludovic111/horizon/issues/1189)) proves a furnace ported tick for tick and holds the ATM10 code-mods plan; the design is redone through the API policy before it merges ([docs/modpacks.md](docs/modpacks.md), docs/api/stability.md).
+Block entities and menus: ticking machines with slots, server menu logic and the menu protocol to clients, energy, item and fluid transfer, data attachments, accessory slots and custom recipe types, with a typed client and server channel and typed config beside them. A draft ([#1189](https://github.com/horizon-rust/horizon/issues/1189)) proves a furnace ported tick for tick and holds the ATM10 code-mods plan; the design is redone through the API policy before it merges ([docs/modpacks.md](docs/modpacks.md), docs/api/stability.md).

 </details>

@@ -486,7 +486,7 @@ Pistons and slime blocks will push players, mobs and items as in vanilla. Today

 <details><summary>Technical</summary>

-Port `PistonMovingBlockEntity.moveCollidedEntities` and `moveStuckEntities` (honey), the slime bounce and `Entity.limitPistonMovement` for `MoverType.PISTON`, in single player and for a server's players. Issues [#1496](https://github.com/ludovic111/horizon/issues/1496), [#1609](https://github.com/ludovic111/horizon/issues/1609), [#1608](https://github.com/ludovic111/horizon/issues/1608), [#1704](https://github.com/ludovic111/horizon/issues/1704), [#1758](https://github.com/ludovic111/horizon/issues/1758).
+Port `PistonMovingBlockEntity.moveCollidedEntities` and `moveStuckEntities` (honey), the slime bounce and `Entity.limitPistonMovement` for `MoverType.PISTON`, in single player and for a server's players. Issues [#1496](https://github.com/horizon-rust/horizon/issues/1496), [#1609](https://github.com/horizon-rust/horizon/issues/1609), [#1608](https://github.com/horizon-rust/horizon/issues/1608), [#1704](https://github.com/horizon-rust/horizon/issues/1704), [#1758](https://github.com/horizon-rust/horizon/issues/1758).

 </details>

@@ -506,7 +506,7 @@ Villages and fights behaving as in vanilla: iron golems defending villages, vill

 <details><summary>Technical</summary>

-Villages: iron golem village goals, villager memories across saves, villager age, job-site claiming on dedicated servers, flower offers ([#1639](https://github.com/ludovic111/horizon/issues/1639) is one report). Combat: the mobs' `attack_knockback` attribute, mace smash logic, the hit knockback source on the host, the fire burnout biome tag. Each is checked against vanilla by a harness ([docs/rust-parity.md](docs/rust-parity.md)).
+Villages: iron golem village goals, villager memories across saves, villager age, job-site claiming on dedicated servers, flower offers ([#1639](https://github.com/horizon-rust/horizon/issues/1639) is one report). Combat: the mobs' `attack_knockback` attribute, mace smash logic, the hit knockback source on the host, the fire burnout biome tag. Each is checked against vanilla by a harness ([docs/rust-parity.md](docs/rust-parity.md)).

 </details>

@@ -516,7 +516,7 @@ Pick the speakers or headphones Horizon plays through, in Music & Sounds.

 <details><summary>Technical</summary>

-An output device list in Music & Sounds, falling back to the system default. [#1035](https://github.com/ludovic111/horizon/issues/1035) started it: a player on an older Windows computer had no sound at all, and a device choice is how such cases are found and fixed.
+An output device list in Music & Sounds, falling back to the system default. [#1035](https://github.com/horizon-rust/horizon/issues/1035) started it: a player on an older Windows computer had no sound at all, and a device choice is how such cases are found and fixed.

 </details>

@@ -544,7 +544,7 @@ Coming soon: sign in with your Microsoft account to play on online-mode servers.

 Device-code sign-in in the launcher and online-mode login in the client ([docs/microsoft-account.md](docs/microsoft-account.md)). It is turned on by setting the app's client id once Minecraft API access is approved; until then the launcher shows "Coming soon".

-More: [#1270](https://github.com/ludovic111/horizon/issues/1270)
+More: [#1270](https://github.com/horizon-rust/horizon/issues/1270)

 </details>

@@ -566,7 +566,7 @@ Builds of the game and the launcher for Macs with an Intel processor.

 <details><summary>Technical</summary>

-x86_64 game and launcher builds, picked per processor ([#1171](https://github.com/ludovic111/horizon/issues/1171)). Before it ships it needs a run on a real Intel Mac: Rosetta on Apple Silicon only proves the CPU code. Requests: [#1161](https://github.com/ludovic111/horizon/issues/1161), [#1792](https://github.com/ludovic111/horizon/issues/1792).
+x86_64 game and launcher builds, picked per processor ([#1171](https://github.com/horizon-rust/horizon/issues/1171)). Before it ships it needs a run on a real Intel Mac: Rosetta on Apple Silicon only proves the CPU code. Requests: [#1161](https://github.com/horizon-rust/horizon/issues/1161), [#1792](https://github.com/horizon-rust/horizon/issues/1792).

 </details>

@@ -576,7 +576,7 @@ Fixes for Linux desktops that use Wayland and Hyprland: fullscreen, the clipboar

 <details><summary>Technical</summary>

-Open: the GUI Scale is clamped to 2 after a restart under Hyprland, while XWayland keeps it ([#1866](https://github.com/ludovic111/horizon/issues/1866)). Earlier reports covered fullscreen dropping on menu clicks, the clipboard and a white overlay ([#1007](https://github.com/ludovic111/horizon/issues/1007), closed). Checked on a real Wayland session.
+Open: the GUI Scale is clamped to 2 after a restart under Hyprland, while XWayland keeps it ([#1866](https://github.com/horizon-rust/horizon/issues/1866)). Earlier reports covered fullscreen dropping on menu clicks, the clipboard and a white overlay ([#1007](https://github.com/horizon-rust/horizon/issues/1007), closed). Checked on a real Wayland session.

 </details>

@@ -600,7 +600,9 @@ You can port a mod to Horizon with your own AI agent on your own computer. Horiz

 <details><summary>Technical</summary>

-A player runs their own agent locally with `horizon-ctl` and the MCP servers ([docs/agent-control.md](docs/agent-control.md)), `cargo horizon-mod`, `horizon-port-pack` and the parity harnesses as the check. Horizon writes the guide ([website/docs/agents.md](website/docs/agents.md), [docs/modpacks.md](docs/modpacks.md)) and runs no agents, accounts or keys for players. The No AI switch turns all of it off.
+A player runs their own agent locally with `horizon-ctl` and the MCP servers ([docs/agent-control.md](docs/agent-control.md)), `cargo horizon-mod`, `horizon-port-pack` and the parity harnesses as the check. Horizon writes the guide (playhorizon.dev/docs/agents, [docs/modpacks.md](docs/modpacks.md)) and runs no agents, accounts or keys for players. The No AI switch turns all of it off.
+
+More: [https://playhorizon.dev/docs/agents](https://playhorizon.dev/docs/agents)

 </details>

@@ -624,7 +626,7 @@ Safer releases: changes to the release machinery need the owner's review, and AI

 <details><summary>Technical</summary>

-`.github/CODEOWNERS` lists the workflows, the release and signing tools, the update-checking code and the installers ([#1015](https://github.com/ludovic111/horizon/issues/1015)); the branch protection that makes it count waits for the `horizon-agent` GitHub App, which reads and writes code, pull requests and issues but can't change settings, workflows, secrets or members, and whose tokens last an hour. It needs the owner to create the App and switch the protection on ([docs/security.md](docs/security.md)).
+`.github/CODEOWNERS` lists the workflows, the release and signing tools, the update-checking code and the installers ([#1015](https://github.com/horizon-rust/horizon/issues/1015)); the branch protection that makes it count waits for the `horizon-agent` GitHub App, which reads and writes code, pull requests and issues but can't change settings, workflows, secrets or members, and whose tokens last an hour. It needs the owner to create the App and switch the protection on ([docs/security.md](docs/security.md)).

 </details>

@@ -634,7 +636,7 @@ Every download Horizon makes is checked against the project's signature, includi

 <details><summary>Technical</summary>

-Releases carry signed checksums, and the launcher and `horizon-server update` refuse anything unsigned ([#1011](https://github.com/ludovic111/horizon/issues/1011), [#1014](https://github.com/ludovic111/horizon/issues/1014)). Left: the first install through `install.sh` and `install.ps1` still trusts only the checksum GitHub publishes, because verifying Ed25519 signatures needs OpenSSL 3, which macOS doesn't ship ([docs/security.md](docs/security.md)).
+Releases carry signed checksums, and the launcher and `horizon-server update` refuse anything unsigned ([#1011](https://github.com/horizon-rust/horizon/issues/1011), [#1014](https://github.com/horizon-rust/horizon/issues/1014)). Left: the first install through `install.sh` and `install.ps1` still trusts only the checksum GitHub publishes, because verifying Ed25519 signatures needs OpenSSL 3, which macOS doesn't ship ([docs/security.md](docs/security.md)).

 </details>

@@ -648,7 +650,7 @@ Far terrain drawn from the world you really built and explored, caves and builds

 <details><summary>Technical</summary>

-Keep a 3D mip store on disk built from real chunks, drawn by the GPU beside the seed preview for areas nobody has visited. Written from scratch and measured before it is kept. Builds on Far Detail and the far-terrain levels of detail already shipped; the open work on them is [#718](https://github.com/ludovic111/horizon/issues/718).
+Keep a 3D mip store on disk built from real chunks, drawn by the GPU beside the seed preview for areas nobody has visited. Written from scratch and measured before it is kept. Builds on Far Detail and the far-terrain levels of detail already shipped; the open work on them is [#718](https://github.com/horizon-rust/horizon/issues/718).

 </details>

@@ -690,7 +692,7 @@ Run Java mods that nobody has rewritten for Horizon yet, through a bridge or a c

 <details><summary>Technical</summary>

-Earlier research ([#527](https://github.com/ludovic111/horizon/issues/527), closed) found that Java mods can't simply run, because they call Minecraft's own classes. Options to look at again: a jar-to-WebAssembly backend, or a bridge for simple Fabric mods. Whatever is chosen has to run inside the same sandbox and capability checks as native mods.
+Earlier research ([#527](https://github.com/horizon-rust/horizon/issues/527), closed) found that Java mods can't simply run, because they call Minecraft's own classes. Options to look at again: a jar-to-WebAssembly backend, or a bridge for simple Fabric mods. Whatever is chosen has to run inside the same sandbox and capability checks as native mods.

 </details>

@@ -702,7 +704,7 @@ Sign in with other account providers, such as Ely.by or any Yggdrasil-compatible

 <details><summary>Technical</summary>

-Issue [#1270](https://github.com/ludovic111/horizon/issues/1270) asks for Ely.by and Yggdrasil-compatible servers with an account selector in the launcher. It builds on the Microsoft sign-in ([docs/microsoft-account.md](docs/microsoft-account.md)).
+Issue [#1270](https://github.com/horizon-rust/horizon/issues/1270) asks for Ely.by and Yggdrasil-compatible servers with an account selector in the launcher. It builds on the Microsoft sign-in ([docs/microsoft-account.md](docs/microsoft-account.md)).

 </details>

@@ -746,7 +748,7 @@ Contraptions and physics like the Create and Aeronautics mods, as a mod for Hori

 <details><summary>Technical</summary>

-Issue [#805](https://github.com/ludovic111/horizon/issues/805) (porting QOL mods) closed with this answer: it would come as a native Horizon mod on the mod API. It needs server mods, entities and rendering first.
+Issue [#805](https://github.com/horizon-rust/horizon/issues/805) (porting QOL mods) closed with this answer: it would come as a native Horizon mod on the mod API. It needs server mods, entities and rendering first.

 </details>

@@ -788,7 +790,7 @@ Vanilla's complete F3 screen: debug options, a profiler chart, ten-second captur

 <details><summary>Technical</summary>

-Today F3 shows position, chunk, light, biome and FPS ([docs/native-client.md](docs/native-client.md)). Vanilla also has F3+F6 debug options with profiles, F3+1 the profiler pie, F3+L a ten-second capture and F3+S the atlas dump ([#562](https://github.com/ludovic111/horizon/issues/562) asked for the F3 editor).
+Today F3 shows position, chunk, light, biome and FPS ([docs/native-client.md](docs/native-client.md)). Vanilla also has F3+F6 debug options with profiles, F3+1 the profiler pie, F3+L a ten-second capture and F3+S the atlas dump ([#562](https://github.com/horizon-rust/horizon/issues/562) asked for the F3 editor).

 </details>

@@ -812,7 +814,7 @@ An optional ray-tracing mode for graphics cards that support it (RTX and recent

 <details><summary>Technical</summary>

-A spike with ray-traced sun shadows, off by default, is a draft ([#1180](https://github.com/ludovic111/horizon/issues/1180)). Reflections, global illumination, Apple M3 and newer if it is cheap, and a performance report per card come after.
+A spike with ray-traced sun shadows, off by default, is a draft ([#1180](https://github.com/horizon-rust/horizon/issues/1180)). Reflections, global illumination, Apple M3 and newer if it is cheap, and a performance report per card come after.

 </details>

@@ -822,7 +824,7 @@ Output for HDR monitors: brighter highlights and richer colour where your screen

 <details><summary>Technical</summary>

-Issue [#1441](https://github.com/ludovic111/horizon/issues/1441). Needs a surface format and a tone-mapping path per backend, and tests on real HDR screens on Windows, macOS and Linux.
+Issue [#1441](https://github.com/horizon-rust/horizon/issues/1441). Needs a surface format and a tone-mapping path per backend, and tests on real HDR screens on Windows, macOS and Linux.

 </details>

@@ -856,7 +858,7 @@ Game and launcher builds for 64-bit ARM Linux computers.

 <details><summary>Technical</summary>

-Issue [#1709](https://github.com/ludovic111/horizon/issues/1709): aarch64 builds of the game and the launcher in the release workflow, tested on a real ARM machine with its Vulkan driver. The server build already drops audio and controllers (`--no-default-features`).
+Issue [#1709](https://github.com/horizon-rust/horizon/issues/1709): aarch64 builds of the game and the launcher in the release workflow, tested on a real ARM machine with its Vulkan driver. The server build already drops audio and controllers (`--no-default-features`).

 </details>

@@ -866,7 +868,7 @@ Versions of Horizon for Android, iOS and web browsers. Nothing official yet; con

 <details><summary>Technical</summary>

-No official build. Android was first closed as not planned, with touch controls, a mobile interface, packaging and loading the player's own assets all missing; the roadmap now includes it, iOS and a WebAssembly build for the browser as long-term goals. First pieces from contributors: `horizon-dualsense` compiling on iOS ([#1813](https://github.com/ludovic111/horizon/issues/1813)) and helper-thread limits on Android ([#1751](https://github.com/ludovic111/horizon/issues/1751)). Preparing without Java ([#1750](https://github.com/ludovic111/horizon/issues/1750)) matters here too. Horizon ships none of Mojang's files on any platform.
+No official build. Android was first closed as not planned, with touch controls, a mobile interface, packaging and loading the player's own assets all missing; the roadmap now includes it, iOS and a WebAssembly build for the browser as long-term goals. First pieces from contributors: `horizon-dualsense` compiling on iOS ([#1813](https://github.com/horizon-rust/horizon/issues/1813)) and helper-thread limits on Android ([#1751](https://github.com/horizon-rust/horizon/issues/1751)). Preparing without Java ([#1750](https://github.com/horizon-rust/horizon/issues/1750)) matters here too. Horizon ships none of Mojang's files on any platform.

 </details>

@@ -910,7 +912,7 @@ An optional AI teammate you can talk to by voice. It plays beside you, helps or

 <details><summary>Technical</summary>

-Draft pull requests: the companion ([#1068](https://github.com/ludovic111/horizon/issues/1068)), its safety modes and their evaluation ([#1069](https://github.com/ludovic111/horizon/issues/1069)) and a route that finishes the game ([#1070](https://github.com/ludovic111/horizon/issues/1070)). In the drafts: a companion that follows, fights, mines, crafts, sleeps and respawns; chat and push-to-talk voice, with speech recognition and a choice of voices; presets (very strong, helper, beat the game); a guard model with Clean, Kid and Salty modes; perception levels from Fair to All-knowing; hardware detection with a simple mode and an Advanced tab; local models first, cloud keys optional. The No AI switch is already in the game. Left: the speedrun route doesn't finish the game reliably yet, voices for more languages, and the safety evaluation, which must pass before it ships.
+Draft pull requests: the companion ([#1068](https://github.com/horizon-rust/horizon/issues/1068)), its safety modes and their evaluation ([#1069](https://github.com/horizon-rust/horizon/issues/1069)) and a route that finishes the game ([#1070](https://github.com/horizon-rust/horizon/issues/1070)). In the drafts: a companion that follows, fights, mines, crafts, sleeps and respawns; chat and push-to-talk voice, with speech recognition and a choice of voices; presets (very strong, helper, beat the game); a guard model with Clean, Kid and Salty modes; perception levels from Fair to All-knowing; hardware detection with a simple mode and an Advanced tab; local models first, cloud keys optional. The No AI switch is already in the game. Left: the speedrun route doesn't finish the game reliably yet, voices for more languages, and the safety evaluation, which must pass before it ships.

 </details>

@@ -936,7 +938,9 @@ Run Horizon's built-in benchmark and share the report: every new computer makes

 <details><summary>Technical</summary>

-`horizon-launcher play --arg=--benchmark --arg=standard` writes a JSON report; `horizon-launcher data benchmark <report>` shows what would be sent and uploads it ([website/docs/performance.md](website/docs/performance.md)). Results from three installs with the same hardware appear on the Benchmarks page. Example: [#1711](https://github.com/ludovic111/horizon/issues/1711).
+`horizon-launcher play --arg=--benchmark --arg=standard` writes a JSON report; `horizon-launcher data benchmark <report>` shows what would be sent and uploads it (playhorizon.dev/docs/performance). Results from three installs with the same hardware appear on the Benchmarks page. Example: [#1711](https://github.com/horizon-rust/horizon/issues/1711).
+
+More: [https://playhorizon.dev/docs/performance](https://playhorizon.dev/docs/performance)

 </details>

@@ -948,7 +952,7 @@ Banners in End cities show as plain magenta instead of with their pattern.

 <details><summary>Technical</summary>

-Compare the banner block entities the End city templates place with vanilla's (`EndCityPieces`, the templates' block entity NBT, `BannerBlockEntity`'s patterns), in `crates/horizon-world/src/worldgen/structure/`. Issue [#1438](https://github.com/ludovic111/horizon/issues/1438); possibly related: [#526](https://github.com/ludovic111/horizon/issues/526).
+Compare the banner block entities the End city templates place with vanilla's (`EndCityPieces`, the templates' block entity NBT, `BannerBlockEntity`'s patterns), in `crates/horizon-world/src/worldgen/structure/`. Issue [#1438](https://github.com/horizon-rust/horizon/issues/1438); possibly related: [#526](https://github.com/horizon-rust/horizon/issues/526).

 </details>

@@ -958,19 +962,19 @@ Armour and tools in End city chests should come enchanted, as in vanilla.

 <details><summary>Technical</summary>

-`loot.rs` implements `enchant_with_levels`: find why the End city chest table's rolls come out bare, and compare them with vanilla's for a few seeds. Issues [#1437](https://github.com/ludovic111/horizon/issues/1437), [#1660](https://github.com/ludovic111/horizon/issues/1660).
+`loot.rs` implements `enchant_with_levels`: find why the End city chest table's rolls come out bare, and compare them with vanilla's for a few seeds. Issues [#1437](https://github.com/horizon-rust/horizon/issues/1437), [#1660](https://github.com/horizon-rust/horizon/issues/1660).

 </details>

 ## Recently shipped

- **OpenGL for old computers** (v0.2.63): Horizon now starts on old PCs whose graphics card has no Vulkan or DirectX 12 driver: it switches to OpenGL by itself, and Options > Graphics can pick OpenGL by hand. [#1917](https://github.com/ludovic111/horizon/issues/1917) · [#1920](https://github.com/ludovic111/horizon/issues/1920) · [#1936](https://github.com/ludovic111/horizon/issues/1936)
- **Server resource packs** (v0.2.48): Servers can send you their resource pack: Horizon asks, downloads it and applies it, like vanilla. [#1562](https://github.com/ludovic111/horizon/issues/1562) · [#1569](https://github.com/ludovic111/horizon/issues/1569) · [#1570](https://github.com/ludovic111/horizon/issues/1570)
- **Single player on its own server thread** (v0.2.39): Single player runs on a server thread, as vanilla does, so the world keeps ticking smoothly while the window draws. [#1514](https://github.com/ludovic111/horizon/issues/1514) · [docs/server-levels.md](docs/server-levels.md)
- **GPU occlusion culling on Macs** (v0.2.17): On Macs the GPU now skips terrain hidden behind hills and caves: 8 to 48% more frames per second at 32 chunks on an M4 Pro. [#1434](https://github.com/ludovic111/horizon/issues/1434)
- **Animated textures on the GPU** (v0.2.5): Water, lava and other animated blocks are now animated by the graphics card: 1.7 to 2.4 times better 1% lows on Intel graphics. [#1239](https://github.com/ludovic111/horizon/issues/1239)
- **Far Detail for integrated graphics** (v0.2.5): An optional Reduced setting for far terrain, suggested on integrated graphics, that saves 2 to 4 ms of GPU time per frame. [#1199](https://github.com/ludovic111/horizon/issues/1199) · [#1029](https://github.com/ludovic111/horizon/issues/1029)
- **The launcher's mod browser** (launcher@0.2.0): Search Modrinth for mods, modpacks and resource packs from the launcher; it says before installing what works in Horizon. [#1154](https://github.com/ludovic111/horizon/issues/1154) · [#1242](https://github.com/ludovic111/horizon/issues/1242) · [#1243](https://github.com/ludovic111/horizon/issues/1243) · [#1246](https://github.com/ludovic111/horizon/issues/1246) · [docs/mod-browser.md](docs/mod-browser.md)
- **A blocky, Minecraft-like launcher** (launcher@0.2.0): The launcher got a new blocky look in Horizon's purple, in dark and light. [#1269](https://github.com/ludovic111/horizon/issues/1269) · [docs/design-system.md](docs/design-system.md)
- **Dynamic lights** (v2026.10.22): An optional extra: torches you hold, drop or set on fire light up what is around them. [#1162](https://github.com/ludovic111/horizon/issues/1162)
- **Host a server from the launcher** (launcher-v0.15.0): The launcher's Servers page creates, starts, backs up and updates a Horizon server with buttons, and invites friends. [#1026](https://github.com/ludovic111/horizon/issues/1026) · [docs/hosting.md](docs/hosting.md)
+- **OpenGL for old computers** (v0.2.63): Horizon now starts on old PCs whose graphics card has no Vulkan or DirectX 12 driver: it switches to OpenGL by itself, and Options > Graphics can pick OpenGL by hand. [#1917](https://github.com/horizon-rust/horizon/issues/1917) · [#1920](https://github.com/horizon-rust/horizon/issues/1920) · [#1936](https://github.com/horizon-rust/horizon/issues/1936)
+- **Server resource packs** (v0.2.48): Servers can send you their resource pack: Horizon asks, downloads it and applies it, like vanilla. [#1562](https://github.com/horizon-rust/horizon/issues/1562) · [#1569](https://github.com/horizon-rust/horizon/issues/1569) · [#1570](https://github.com/horizon-rust/horizon/issues/1570)
+- **Single player on its own server thread** (v0.2.39): Single player runs on a server thread, as vanilla does, so the world keeps ticking smoothly while the window draws. [#1514](https://github.com/horizon-rust/horizon/issues/1514) · [docs/server-levels.md](docs/server-levels.md)
+- **GPU occlusion culling on Macs** (v0.2.17): On Macs the GPU now skips terrain hidden behind hills and caves: 8 to 48% more frames per second at 32 chunks on an M4 Pro. [#1434](https://github.com/horizon-rust/horizon/issues/1434)
+- **Animated textures on the GPU** (v0.2.5): Water, lava and other animated blocks are now animated by the graphics card: 1.7 to 2.4 times better 1% lows on Intel graphics. [#1239](https://github.com/horizon-rust/horizon/issues/1239)
+- **Far Detail for integrated graphics** (v0.2.5): An optional Reduced setting for far terrain, suggested on integrated graphics, that saves 2 to 4 ms of GPU time per frame. [#1199](https://github.com/horizon-rust/horizon/issues/1199) · [#1029](https://github.com/horizon-rust/horizon/issues/1029)
+- **The launcher's mod browser** (launcher@0.2.0): Search Modrinth for mods, modpacks and resource packs from the launcher; it says before installing what works in Horizon. [#1154](https://github.com/horizon-rust/horizon/issues/1154) · [#1242](https://github.com/horizon-rust/horizon/issues/1242) · [#1243](https://github.com/horizon-rust/horizon/issues/1243) · [#1246](https://github.com/horizon-rust/horizon/issues/1246) · [docs/mod-browser.md](docs/mod-browser.md)
+- **A blocky, Minecraft-like launcher** (launcher@0.2.0): The launcher got a new blocky look in Horizon's purple, in dark and light. [#1269](https://github.com/horizon-rust/horizon/issues/1269) · [docs/design-system.md](docs/design-system.md)
+- **Dynamic lights** (v2026.10.22): An optional extra: torches you hold, drop or set on fire light up what is around them. [#1162](https://github.com/horizon-rust/horizon/issues/1162)
+- **Host a server from the launcher** (launcher-v0.15.0): The launcher's Servers page creates, starts, backs up and updates a Horizon server with buttons, and invites friends. [#1026](https://github.com/horizon-rust/horizon/issues/1026) · [docs/hosting.md](docs/hosting.md)
@@ -119,7 +119,7 @@ machines during the runs.

 ## Reproduce

-    curl -fsSL https://raw.githubusercontent.com/ludovic111/horizon/main/packaging/server/install.sh | sh
+    curl -fsSL https://raw.githubusercontent.com/horizon-rust/horizon/main/packaging/server/install.sh | sh
    horizon-prepare --prepare --server-jar /path/to/server.jar      # your own copy
    cargo build --release -p horizon-bots                            # on the machine that runs the bots
    # in a checkout whose .local/minecraft holds the pinned vanilla jars (tools/lab.py prepare):
@@ -148,7 +148,7 @@ early, wrote no report. Its lines come from its output.

 ## Reproduce

-    curl -fsSL https://raw.githubusercontent.com/ludovic111/horizon/main/packaging/server/install.sh | sh
+    curl -fsSL https://raw.githubusercontent.com/horizon-rust/horizon/main/packaging/server/install.sh | sh
    horizon-prepare --prepare --server-jar /path/to/server.jar      # your own copy
    cargo build --release -p horizon-bots                            # on the machine that runs the bots
    # in a checkout whose .local/minecraft holds the pinned vanilla jars (tools/lab.py prepare):
@@ -103,7 +103,7 @@ the Nix store, so the run set `LD_LIBRARY_PATH` to them (see #898).

 ## Reproduce

-    curl -fsSL https://raw.githubusercontent.com/ludovic111/horizon/main/packaging/server/install.sh | sh
+    curl -fsSL https://raw.githubusercontent.com/horizon-rust/horizon/main/packaging/server/install.sh | sh
    horizon-prepare --prepare --server-jar /path/to/server.jar      # your own copy
    cargo build --release -p horizon-bots                            # on the machine that runs the bots
    # in a checkout whose .local/minecraft holds the pinned vanilla jars (tools/lab.py prepare):
@@ -200,7 +200,7 @@ fn play(path: &Path, report: &mut Report) -> Result<(), String> {
        return Err(format!("it didn't start: {reason}"));
    }
    let client: Vec<String> = mods.commands().map(str::to_owned).collect();
-    let server: Vec<String> = mods.server_commands().map(str::to_owned).collect();
+    let server: Vec<String> = mods.server_commands().map(|c| c.name.clone()).collect();
    report.commands = [client.clone(), server.clone()].concat();
    // A server mod plays with one player on, who joins, chats and leaves.
    let steve = ServerPlayer {
@@ -262,9 +262,21 @@ fn play(path: &Path, report: &mut Report) -> Result<(), String> {
                format!("{}: {text}", if error { "error" } else { "feedback" })
            }
            Output::Command { line } => format!("command: /{line}"),
+            Output::QuietCommands { lines, .. } => {
+                format!("{} quiet command(s)", lines.len())
+            }
            Output::Stopped { reason, .. } => return Err(format!("it stopped: {reason}")),
+            Output::SetBlocks {
+                dimension, blocks, ..
+            } => {
+                format!("set {} block(s) in {dimension}", blocks.len())
+            }
            Output::OpenScreen { .. } => "opened a screen".to_string(),
            Output::CloseScreen { .. } => "closed its screen".to_string(),
+            Output::PlaceRecipe { book_id, all } => {
+                format!("placed recipe {book_id}{}", if all { " (all)" } else { "" })
+            }
+            Output::Give { item, count, .. } => format!("gave {count} {item}"),
            Output::Shake { strength, seconds } => {
                format!("shook the camera: {strength:.2} for {seconds:.1} s")
            }
@@ -25,7 +25,7 @@ use std::{
 };

 const TARGET: &str = "wasm32-unknown-unknown";
-const SDK_GIT: &str = "{ git = \"https://github.com/ludovic111/horizon\" }";
+const SDK_GIT: &str = "{ git = \"https://github.com/horizon-rust/horizon\" }";

 fn main() -> ExitCode {
    // Cargo runs `cargo-horizon-mod horizon-mod <args>`.
@@ -1,5 +1,5 @@
 //! `cargo horizon-mod registry build|review|check|list`: the registry repository's CI
-//! (`ludovic111/horizon-mods`, docs/api/mod-index.md). Network-free: the
+//! (`horizon-rust/horizon-mods`, docs/api/mod-index.md). Network-free: the
 //! workflow downloads the files and publishes what this writes.
 use horizon_mods::index::{
    FILE_HOST,
@@ -8,7 +8,7 @@ use horizon_mods::index::{
 use std::path::Path;

 /// Where the registry's site is published (its icons).
-const SITE: &str = "https://ludovic111.github.io/horizon-mods/";
+const SITE: &str = "https://horizon-rust.github.io/horizon-mods/";

 const USAGE: &str = "usage: cargo horizon-mod registry build <checkout> --files <dir> --out <index.json> [--release <url>] [--site <url>] [--generated <time>]
       cargo horizon-mod registry review <base checkout> <head checkout> --author <login> [--json]
@@ -1031,19 +1031,22 @@ pub struct ItemModels {
 }

 impl ItemModels {
-    pub fn components(&self, stack: &StackView) -> Components {
-        let mut out = self
-            .prototypes
-            .get(&stack.item)
-            .cloned()
-            .unwrap_or_default();
+    /// The stack's components: its item's defaults with the stack's patch on top. A stack
+    /// with no patch (most stacks a screen draws) borrows the defaults instead of copying them.
+    pub fn components(&self, stack: &StackView) -> std::borrow::Cow<'_, Components> {
+        static NONE: Components = BTreeMap::new();
+        let prototype = self.prototypes.get(&stack.item).unwrap_or(&NONE);
+        if stack.patch.is_empty() {
+            return std::borrow::Cow::Borrowed(prototype);
+        }
+        let mut out = prototype.clone();
        for (key, value) in &stack.patch {
            match value {
                Some(v) => out.insert(key.clone(), v.clone()),
                None => out.remove(key),
            };
        }
-        out
+        std::borrow::Cow::Owned(out)
    }
    /// `ItemModelResolver.updateForTopItem`.
    pub fn resolve(&self, stack: &StackView, ctx: &Context, env: &dyn ItemEnv) -> ResolvedItem {
@@ -0,0 +1,14 @@
+[package]
+name = "horizon-client-core"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version = "1.90"
+description = "The client's lowest layer: chat text and translations, SNBT and NBT paths, the scoreboard, boss bars, game rules and the registry and particle tables commands name"
+
+[dependencies]
+horizon-world = { path = "../horizon-world" }
+serde_json = { version = "1.0.151", features = ["raw_value"] }
+
+[lints]
+workspace = true
@@ -61,6 +61,16 @@ fn f32_tag(v: f32) -> Tag {
    Tag::Float(v.to_bits())
 }

+/// `TheEndGatewayBlockEntity.loadAdditional`: BlockPos.CODEC and Level.isInSpawnableBounds.
+pub fn gateway_exit(tag: &Tag) -> Option<[i32; 3]> {
+    let Tag::IntArray(v) = tag else { return None };
+    let p: [i32; 3] = v.as_slice().try_into().ok()?;
+    ((-30_000_000..30_000_000).contains(&p[0])
+        && (-20_000_000..20_000_000).contains(&p[1])
+        && (-30_000_000..30_000_000).contains(&p[2]))
+    .then_some(p)
+}
+
 /// What a block entity reads and writes, in `saveAdditional` order.
 struct Fields<'a> {
    input: &'a Tag,
@@ -259,7 +269,7 @@ fn is_pos(tag: &Tag) -> bool {
    matches!(tag, Tag::IntArray(v) if v.len() == 3)
 }
 /// The loaded `SignText` of one side, or the empty text.
-pub(crate) fn sign_side(tag: Option<&Tag>) -> Tag {
+pub fn sign_side(tag: Option<&Tag>) -> Tag {
    let empty = || string("");
    let mut messages: Vec<Tag> = match tag.and_then(|t| t.get("messages")) {
        Some(Tag::List(list)) => list.iter().filter_map(component).collect(),
@@ -424,10 +434,7 @@ pub fn canonical(tag: &Tag) -> Option<Tag> {
        }
        "minecraft:end_gateway" => {
            f.long("Age", 0);
-            f.keep("exit_portal", |t| {
-                is_pos(t)
-                    && matches!(t, Tag::IntArray(v) if v[1].abs() <= 30_000_000 && v[0].abs() <= 30_000_000 && v[2].abs() <= 30_000_000)
-            });
+            f.keep("exit_portal", |t| gateway_exit(t).is_some());
            if flag(tag.get("ExactTeleport")) == Some(true) {
                f.put("ExactTeleport", boolean(true));
            }
@@ -1,6 +1,7 @@
 //! Text components from commands: `ComponentArgument` reads an SNBT (or JSON)
 //! value, `ComponentSerialization` turns it into styled text.
 use crate::text::{Style, Text, named_color};
+use horizon_world::nbt::Tag;
 use serde_json::{Map, Value};

 /// `SnbtGrammar`, enough for components: compounds, lists, quoted and
@@ -173,20 +174,48 @@ fn object_style(o: &serde_json::Map<String, Value>) -> Style {
    if let Some(e) = o.get("click_event").and_then(Value::as_object) {
        let text = |k: &str| e.get(k).and_then(Value::as_str).map(str::to_owned);
        style.click = match e.get("action").and_then(Value::as_str) {
+            // ClickEvent.OpenUrl.CODEC: ExtraCodecs.UNTRUSTED_URI allows http and
+            // https only, the scheme in any case (Util.parseAndValidateUntrustedUri).
+            Some("open_url") => text("url")
+                .filter(|u| {
+                    u.split_once(':').is_some_and(|(scheme, _)| {
+                        scheme.eq_ignore_ascii_case("http") || scheme.eq_ignore_ascii_case("https")
+                    })
+                })
+                .map(crate::text::ClickEvent::OpenUrl),
+            // ClickEvent.ChangePage.CODEC: ExtraCodecs.POSITIVE_INT.
+            Some("change_page") => e
+                .get("page")
+                .and_then(Value::as_i64)
+                .and_then(|p| i32::try_from(p).ok())
+                .filter(|p| *p >= 1)
+                .map(crate::text::ClickEvent::ChangePage),
            Some("suggest_command") => text("command").map(crate::text::ClickEvent::SuggestCommand),
+            Some("run_command") => text("command").map(crate::text::ClickEvent::RunCommand),
            Some("copy_to_clipboard") => {
                text("value").map(crate::text::ClickEvent::CopyToClipboard)
            }
            _ => None,
        };
    }
-    // HoverEvent.ShowText.
-    if let Some(e) = o.get("hover_event").and_then(Value::as_object)
-        && e.get("action").and_then(Value::as_str) == Some("show_text")
-        && let Some(value) = e.get("value")
-    {
-        style.hover = Some(Box::new(to_text(value, &mut |s| Text::literal(s))));
+    // HoverEvent.ShowText and ShowItem.
+    if let Some(e) = o.get("hover_event").and_then(Value::as_object) {
+        match e.get("action").and_then(Value::as_str) {
+            Some("show_text") => {
+                if let Some(value) = e.get("value") {
+                    style.hover = Some(Box::new(to_text(value, &mut |s| Text::literal(s))));
+                }
+            }
+            Some("show_item") if e.get("id").is_some_and(Value::is_string) => {
+                style.hover_item = Some(Box::new(Value::Object(e.clone())));
+            }
+            _ => {}
+        }
    }
+    style.insertion = o
+        .get("insertion")
+        .and_then(Value::as_str)
+        .map(str::to_owned);
    style
 }
 /// `ComponentSerialization.CODEC` decoding into text. `selector` components
@@ -252,7 +281,7 @@ pub fn to_text_with(
            } else if let Some(sel) = o.get("selector").and_then(Value::as_str) {
                resolve(sel)
            } else if let Some(key) = o.get("keybind").and_then(Value::as_str) {
-                crate::keybinds::display_name(key)
+                crate::key_display::display_name(key)
            } else {
                Text::empty()
            };
@@ -271,6 +300,15 @@ pub fn to_text_with(
    }
 }

+/// `CustomName` as text: a string keeps its legacy formatting codes, anything
+/// else is a component (`ComponentSerialization`).
+pub fn name_text(tag: &Tag) -> Text {
+    match tag {
+        Tag::String(s) => Text::legacy(&s.to_string_lossy()),
+        t => crate::scoreboard::comp_text(&crate::scoreboard::tag_to_json(t)),
+    }
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -292,27 +292,4 @@ mod tests {
        assert_eq!(GameRules::load(&dir), rules);
        let _ = fs::remove_dir_all(dir);
    }
-    /// The world's save (Level.write) writes the rules as they are now, and a
-    /// world opened again reads them back (#74).
-    #[test]
-    fn level_save_keeps_changed_rules() {
-        let dir =
-            std::env::temp_dir().join(format!("horizon-gamerules-level-{}", std::process::id()));
-        let _ = fs::remove_dir_all(&dir);
-        let mut level = crate::save::Level::default();
-        level.write(&dir).unwrap();
-        // Rules changed while playing, then saved and loaded again.
-        let mut rules = GameRules::load(&dir);
-        assert_eq!(rules, GameRules::default());
-        assert!(rules.set("advance_time", Value::Bool(false)));
-        assert!(rules.set("advance_weather", Value::Bool(false)));
-        assert!(rules.set("random_tick_speed", Value::Int(0)));
-        level.game_rules = rules.by_name();
-        level.write(&dir).unwrap();
-        assert_eq!(GameRules::load(&dir), rules);
-        let read = crate::save::Level::read(&dir).unwrap();
-        assert_eq!(read.game_rules, rules.by_name());
-        assert_eq!(read.game_rule("advance_time"), 0);
-        let _ = fs::remove_dir_all(dir);
-    }
 }
@@ -0,0 +1,18 @@
+//! Resource identifiers (`Identifier`).
+
+/// Identifier.parse: `ns:path` or `path`, validated.
+pub fn parse_identifier(raw: &str) -> Option<String> {
+    let (ns, path) = match raw.split_once(':') {
+        Some(("", path)) => ("minecraft", path),
+        Some((ns, path)) => (ns, path),
+        None => ("minecraft", raw),
+    };
+    let ns_ok = ns != ".."
+        && ns
+            .chars()
+            .all(|c| c.is_ascii_lowercase() || c.is_ascii_digit() || matches!(c, '_' | '.' | '-'));
+    let path_ok = path.chars().all(|c| {
+        c.is_ascii_lowercase() || c.is_ascii_digit() || matches!(c, '_' | '.' | '-' | '/')
+    });
+    (ns_ok && path_ok).then(|| format!("{ns}:{path}"))
+}
@@ -0,0 +1,38 @@
+//! Key display names (`InputConstants.Key.getDisplayName`), shared by key
+//! mappings and `keybind` text components.
+use crate::text::Text;
+
+/// InputConstants.Key.getDisplayName: one-character keys as the upper-case
+/// character, others by translation.
+pub fn display_name(key: &str) -> Text {
+    if let Some(rest) = key.strip_prefix("key.keyboard.")
+        && rest.chars().count() == 1
+    {
+        let c = rest.to_uppercase();
+        return Text::literal(c);
+    }
+    let symbol = match key {
+        "key.keyboard.minus" => Some("-"),
+        "key.keyboard.equal" => Some("="),
+        "key.keyboard.left.bracket" => Some("["),
+        "key.keyboard.right.bracket" => Some("]"),
+        "key.keyboard.backslash" => Some("\\"),
+        "key.keyboard.semicolon" => Some(";"),
+        "key.keyboard.apostrophe" => Some("'"),
+        "key.keyboard.grave.accent" => Some("`"),
+        "key.keyboard.comma" => Some(","),
+        "key.keyboard.period" => Some("."),
+        "key.keyboard.slash" => Some("/"),
+        _ => None,
+    };
+    if let Some(s) = symbol {
+        return Text::literal(s);
+    }
+    if let Some(n) = key.strip_prefix("key.mouse.")
+        && n.parse::<u32>().is_ok()
+        && !crate::lang::has(key)
+    {
+        return Text::translate("key.mouse", &[Text::literal(n)]);
+    }
+    Text::translate(key, &[])
+}
@@ -4,7 +4,10 @@
 //! language used by every screen.
 use std::{
    collections::{BTreeMap, HashMap},
-    sync::{Arc, RwLock},
+    sync::{
+        Arc, RwLock,
+        atomic::{AtomicBool, Ordering},
+    },
 };

 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -23,11 +26,16 @@ impl LanguageInfo {
 #[derive(Default)]
 pub struct Language {
    pub code: String,
+    /// `LanguageInfo.bidirectional`: text without a strong character reads
+    /// right to left (`ClientLanguage.defaultRightToLeft`).
+    bidirectional: bool,
    map: HashMap<String, String>,
 }
 pub const DEFAULT: &str = "en_us";

 static CURRENT: RwLock<Option<Arc<Language>>> = RwLock::new(None);
+/// The current language's `bidirectional`, read for every drawn string.
+static BIDIRECTIONAL: AtomicBool = AtomicBool::new(false);

 /// A source of resource files: the prepared root plus packs, highest priority last.
 pub trait ResourceSource {
@@ -42,8 +50,12 @@ struct Bundled;
 impl ResourceSource for Bundled {
    fn read(&self, path: &str) -> Option<Vec<u8>> {
        let body = match path {
-            "assets/horizon/lang/en_us.json" => include_str!("../assets/horizon/lang/en_us.json"),
-            "assets/horizon/lang/ru_ru.json" => include_str!("../assets/horizon/lang/ru_ru.json"),
+            "assets/horizon/lang/en_us.json" => {
+                include_str!("../../horizon-client/assets/horizon/lang/en_us.json")
+            }
+            "assets/horizon/lang/ru_ru.json" => {
+                include_str!("../../horizon-client/assets/horizon/lang/ru_ru.json")
+            }
            _ => return None,
        };
        Some(body.as_bytes().to_vec())
@@ -130,8 +142,12 @@ impl Language {
        {
            apply_deprecated(&mut map, &bytes);
        }
+        let bidirectional = available(sources)
+            .iter()
+            .any(|info| info.code == code && info.bidirectional);
        Self {
            code: code.to_owned(),
+            bidirectional,
            map,
        }
    }
@@ -193,11 +209,16 @@ pub fn available(sources: &[&dyn ResourceSource]) -> Vec<LanguageInfo> {
 }

 pub fn set(language: Language) {
+    BIDIRECTIONAL.store(language.bidirectional, Ordering::Relaxed);
    *CURRENT.write().unwrap_or_else(|e| e.into_inner()) = Some(Arc::new(language));
 }
 pub fn current() -> Option<Arc<Language>> {
    CURRENT.read().unwrap_or_else(|e| e.into_inner()).clone()
 }
+/// `ClientLanguage.defaultRightToLeft` of the current language.
+pub fn bidirectional() -> bool {
+    BIDIRECTIONAL.load(Ordering::Relaxed)
+}
 pub fn code() -> String {
    current().map_or_else(|| DEFAULT.to_owned(), |l| l.code.clone())
 }
@@ -0,0 +1,28 @@
+//! The client's lowest layer, below commands and gameplay: chat text and
+//! translations, SNBT and NBT paths, text components, the scoreboard, boss
+//! bars, game rules, block entity NBT tables, and the registry, particle and
+//! sound source tables commands name, and the `pack.mcmeta` filter regex.
+//! horizon-client re-exports each module under its old path
+//! (`horizon_client::text`, ...).
+#![forbid(unsafe_code)]
+pub mod block_entity_nbt;
+pub mod bossbar;
+pub mod component;
+pub mod fastutil_order;
+pub mod gamerules;
+pub mod identifier;
+pub mod key_display;
+pub mod lang;
+pub mod nbt_path;
+pub mod nbt_value;
+pub mod particle_type;
+pub mod pattern;
+pub mod potions;
+pub mod registries;
+pub mod scoreboard;
+pub mod snbt;
+pub mod sound_source;
+pub mod text;
+pub mod uuid;
+pub mod who;
+pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
@@ -0,0 +1,24 @@
+//! Reading and writing single NBT values the way vanilla's codecs accept them.
+use horizon_world::nbt::Tag;
+
+pub fn string(s: &str) -> Tag {
+    Tag::String(s.into())
+}
+pub fn text(tag: Option<&Tag>) -> Option<String> {
+    match tag {
+        Some(Tag::String(s)) => Some(s.to_string_lossy()),
+        _ => None,
+    }
+}
+/// Any numeric tag as i64 (vanilla's `getIntOr` etc. accept every number type).
+pub fn number(tag: Option<&Tag>) -> Option<i64> {
+    Some(match tag? {
+        Tag::Byte(v) => i64::from(*v),
+        Tag::Short(v) => i64::from(*v),
+        Tag::Int(v) => i64::from(*v),
+        Tag::Long(v) => *v,
+        Tag::Float(b) => f32::from_bits(*b) as i64,
+        Tag::Double(b) => f64::from_bits(*b) as i64,
+        _ => return None,
+    })
+}
@@ -0,0 +1,209 @@
+//! Particle types (`ParticleTypes`): the vanilla particle types with a client
+//! implementation, by registry name, and their per-type flags.
+
+macro_rules! particle_types {
+    ($($variant:ident = $name:literal),* $(,)?) => {
+        /// Vanilla particle types with a client implementation here.
+        #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+        pub enum ParticleType { $($variant),* }
+        impl ParticleType {
+            pub const ALL: &'static [ParticleType] = &[$(ParticleType::$variant),*];
+            /// Registry path (`minecraft:<name>`), also the sprite-set file name.
+            pub fn name(self) -> &'static str {
+                match self { $(ParticleType::$variant => $name),* }
+            }
+            pub fn from_name(name: &str) -> Option<Self> {
+                let name = name.strip_prefix("minecraft:").unwrap_or(name);
+                match name { $($name => Some(ParticleType::$variant),)* _ => None }
+            }
+        }
+    };
+}
+particle_types! {
+    Block = "block",
+    BlockCrumble = "block_crumble",
+    Trail = "trail",
+    DustPillar = "dust_pillar",
+    FallingDust = "falling_dust",
+    Smoke = "smoke",
+    LargeSmoke = "large_smoke",
+    WhiteSmoke = "white_smoke",
+    Flame = "flame",
+    SoulFireFlame = "soul_fire_flame",
+    CopperFireFlame = "copper_fire_flame",
+    SmallFlame = "small_flame",
+    Lava = "lava",
+    DrippingWater = "dripping_water",
+    FallingWater = "falling_water",
+    DrippingLava = "dripping_lava",
+    FallingLava = "falling_lava",
+    LandingLava = "landing_lava",
+    DrippingHoney = "dripping_honey",
+    FallingHoney = "falling_honey",
+    LandingHoney = "landing_honey",
+    FallingNectar = "falling_nectar",
+    FallingSporeBlossom = "falling_spore_blossom",
+    SporeBlossomAir = "spore_blossom_air",
+    DrippingObsidianTear = "dripping_obsidian_tear",
+    FallingObsidianTear = "falling_obsidian_tear",
+    LandingObsidianTear = "landing_obsidian_tear",
+    DrippingDripstoneWater = "dripping_dripstone_water",
+    FallingDripstoneWater = "falling_dripstone_water",
+    DrippingDripstoneLava = "dripping_dripstone_lava",
+    FallingDripstoneLava = "falling_dripstone_lava",
+    Splash = "splash",
+    Rain = "rain",
+    Bubble = "bubble",
+    SulfurBubbles = "sulfur_bubbles",
+    BubblePop = "bubble_pop",
+    BubbleColumnUp = "bubble_column_up",
+    CurrentDown = "current_down",
+    Underwater = "underwater",
+    Portal = "portal",
+    ReversePortal = "reverse_portal",
+    Enchant = "enchant",
+    Nautilus = "nautilus",
+    VaultConnection = "vault_connection",
+    Crit = "crit",
+    EnchantedHit = "enchanted_hit",
+    DamageIndicator = "damage_indicator",
+    Heart = "heart",
+    AngryVillager = "angry_villager",
+    HappyVillager = "happy_villager",
+    Composter = "composter",
+    Mycelium = "mycelium",
+    Dolphin = "dolphin",
+    EggCrack = "egg_crack",
+    Poof = "poof",
+    Explosion = "explosion",
+    ExplosionEmitter = "explosion_emitter",
+    CampfireCosySmoke = "campfire_cosy_smoke",
+    CampfireSignalSmoke = "campfire_signal_smoke",
+    Note = "note",
+    Dust = "dust",
+    TotemOfUndying = "totem_of_undying",
+    Firework = "firework",
+    EndRod = "end_rod",
+    Ash = "ash",
+    WhiteAsh = "white_ash",
+    CrimsonSpore = "crimson_spore",
+    WarpedSpore = "warped_spore",
+    CherryLeaves = "cherry_leaves",
+    PaleOakLeaves = "pale_oak_leaves",
+    TintedLeaves = "tinted_leaves",
+    Effect = "effect",
+    InstantEffect = "instant_effect",
+    EntityEffect = "entity_effect",
+    Witch = "witch",
+    Infested = "infested",
+    Cloud = "cloud",
+    Sneeze = "sneeze",
+    Snowflake = "snowflake",
+    Soul = "soul",
+    SculkSoul = "sculk_soul",
+    DragonBreath = "dragon_breath",
+    Gust = "gust",
+    SmallGust = "small_gust",
+    GustEmitterLarge = "gust_emitter_large",
+    GustEmitterSmall = "gust_emitter_small",
+    DustColorTransition = "dust_color_transition",
+    SculkCharge = "sculk_charge",
+    SculkChargePop = "sculk_charge_pop",
+    Shriek = "shriek",
+    SonicBoom = "sonic_boom",
+    Vibration = "vibration",
+    SweepAttack = "sweep_attack",
+    Glow = "glow",
+    WaxOn = "wax_on",
+    WaxOff = "wax_off",
+    ElectricSpark = "electric_spark",
+    Scrape = "scrape",
+    SquidInk = "squid_ink",
+    GlowSquidInk = "glow_squid_ink",
+    Item = "item",
+    ItemSlime = "item_slime",
+    ItemSnowball = "item_snowball",
+    ItemCobweb = "item_cobweb",
+    SulfurCubeGoo = "sulfur_cube_goo",
+    Flash = "flash",
+    Firefly = "firefly",
+    TrialSpawnerDetection = "trial_spawner_detection",
+    TrialSpawnerDetectionOminous = "trial_spawner_detection_ominous",
+    TrialOmen = "trial_omen",
+    RaidOmen = "raid_omen",
+    OminousSpawning = "ominous_spawning",
+    Spit = "spit",
+    Fishing = "fishing",
+    DustPlume = "dust_plume",
+    RedPoplarLeaves = "red_poplar_leaves",
+    OrangePoplarLeaves = "orange_poplar_leaves",
+    YellowPoplarLeaves = "yellow_poplar_leaves",
+    PauseMobGrowth = "pause_mob_growth",
+    ResetMobGrowth = "reset_mob_growth",
+    BlockMarker = "block_marker",
+}
+impl ParticleType {
+    /// `ParticleType.getOverrideLimiter` (`ParticleTypes.register(name, true)`):
+    /// spawned regardless of distance.
+    pub fn override_limiter(self) -> bool {
+        matches!(
+            self,
+            Self::BlockMarker
+                | Self::DamageIndicator
+                | Self::ExplosionEmitter
+                | Self::Explosion
+                | Self::Gust
+                | Self::GustEmitterLarge
+                | Self::GustEmitterSmall
+                | Self::SonicBoom
+                | Self::SculkCharge
+                | Self::SculkChargePop
+                | Self::Vibration
+                | Self::Poof
+                | Self::Spit
+                | Self::SquidInk
+                | Self::SweepAttack
+                | Self::CampfireCosySmoke
+                | Self::CampfireSignalSmoke
+                | Self::GlowSquidInk
+                | Self::Glow
+                | Self::WaxOn
+                | Self::WaxOff
+                | Self::ElectricSpark
+                | Self::Scrape
+                | Self::TrialSpawnerDetection
+                | Self::TrialSpawnerDetectionOminous
+                | Self::VaultConnection
+                | Self::OminousSpawning
+        )
+    }
+    /// `SingleQuadParticle.Layer.translucent`: types whose vanilla particle class
+    /// hardcodes the translucent layer, drawn after translucent terrain.
+    /// `TerrainParticle`, `BreakingItemParticle` and `BlockMarker` resolve their
+    /// layer from the sprite instead (`Layer.bySprite`); see the `translucent`
+    /// sprite set on the engine.
+    pub fn translucent_layer(self) -> bool {
+        match self {
+            // CampfireSmokeParticle.
+            Self::CampfireCosySmoke | Self::CampfireSignalSmoke
+            // PlayerCloudParticle.
+            | Self::Cloud | Self::Sneeze
+            // SpellParticle.
+            | Self::Effect | Self::InstantEffect | Self::EntityEffect
+            | Self::Witch | Self::Infested | Self::TrialOmen | Self::RaidOmen
+            // EmissiveRisingParticle.
+            | Self::Soul | Self::SculkSoul
+            // SculkChargeParticle, SculkChargePopParticle, ShriekParticle,
+            // VibrationSignalParticle, FireflyParticle, OverlayParticle.
+            | Self::SculkCharge | Self::SculkChargePop | Self::Shriek
+            | Self::Vibration | Self::Firefly | Self::Flash
+            // SimpleAnimatedParticle and its subclasses: EndRodParticle,
+            // SparkParticle (firework), SquidInkParticle, TotemParticle.
+            | Self::EndRod | Self::Firework | Self::SquidInk | Self::GlowSquidInk
+            | Self::TotemOfUndying
+            // FlyTowardsPositionParticle: its LifetimeAlpha(0, 0.6, 0.25, 1) is not opaque.
+            | Self::VaultConnection => true,
+            _ => false,
+        }
+    }
+}
@@ -0,0 +1,249 @@
+//! The `MobEffects` and `Potions` registries (code in vanilla, ported as
+//! tables): each effect's colour and category, each potion's effects, and the
+//! potion colour mix. horizon-client re-exports them from `brewing`.
+use std::{collections::HashMap, sync::OnceLock};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Category {
+    Beneficial,
+    Harmful,
+    Neutral,
+}
+/// A `MobEffect`: id (without namespace), colour, category, instantaneous.
+#[derive(Clone, Copy, Debug)]
+pub struct EffectDef {
+    pub id: &'static str,
+    pub color: u32,
+    pub category: Category,
+    pub instant: bool,
+}
+const fn fx(id: &'static str, color: u32, category: Category) -> EffectDef {
+    EffectDef {
+        id,
+        color,
+        category,
+        instant: false,
+    }
+}
+use Category::{Beneficial as B, Harmful as H, Neutral as N};
+/// `MobEffects` in registration order.
+pub const EFFECTS: &[EffectDef] = &[
+    fx("speed", 3402751, B),
+    fx("slowness", 9154528, H),
+    fx("haste", 14270531, B),
+    fx("mining_fatigue", 4866583, H),
+    fx("strength", 16762624, B),
+    EffectDef {
+        id: "instant_health",
+        color: 16262179,
+        category: B,
+        instant: true,
+    },
+    EffectDef {
+        id: "instant_damage",
+        color: 11101546,
+        category: H,
+        instant: true,
+    },
+    fx("jump_boost", 16646020, B),
+    fx("nausea", 5578058, H),
+    fx("regeneration", 13458603, B),
+    fx("resistance", 9520880, B),
+    fx("fire_resistance", 16750848, B),
+    fx("water_breathing", 10017472, B),
+    fx("invisibility", 16185078, B),
+    fx("blindness", 2039587, H),
+    fx("night_vision", 12779366, B),
+    fx("hunger", 5797459, H),
+    fx("weakness", 4738376, H),
+    fx("poison", 8889187, H),
+    fx("wither", 7561558, H),
+    fx("health_boost", 16284963, B),
+    fx("absorption", 2445989, B),
+    EffectDef {
+        id: "saturation",
+        color: 16262179,
+        category: B,
+        instant: true,
+    },
+    fx("glowing", 9740385, N),
+    fx("levitation", 13565951, H),
+    fx("luck", 5882118, B),
+    fx("unluck", 12624973, H),
+    fx("slow_falling", 15978425, B),
+    fx("conduit_power", 1950417, B),
+    fx("dolphins_grace", 8954814, B),
+    fx("bad_omen", 745784, N),
+    fx("hero_of_the_village", 4521796, B),
+    fx("darkness", 2696993, H),
+    fx("trial_omen", 1484454, N),
+    fx("raid_omen", 14565464, N),
+    fx("wind_charged", 12438015, H),
+    fx("weaving", 7891290, H),
+    fx("oozing", 10092451, H),
+    fx("infested", 9214860, H),
+    fx("breath_of_the_nautilus", 65518, B),
+];
+pub fn effect(id: &str) -> Option<&'static EffectDef> {
+    let id = id.trim_start_matches("minecraft:");
+    EFFECTS.iter().find(|e| e.id == id)
+}
+/// Namespaced effect ids for mob effect storage.
+pub fn namespaced(id: &'static str) -> &'static str {
+    static IDS: OnceLock<HashMap<&'static str, &'static str>> = OnceLock::new();
+    IDS.get_or_init(|| {
+        EFFECTS
+            .iter()
+            .map(|e| {
+                (
+                    e.id,
+                    &*Box::leak(format!("minecraft:{}", e.id).into_boxed_str()),
+                )
+            })
+            .collect()
+    })
+    .get(id)
+    .copied()
+    .unwrap_or(id)
+}
+/// A `Potion`: id, name suffix (`item.minecraft.potion.effect.<name>`) and
+/// effects as (effect, duration ticks, amplifier).
+#[derive(Clone, Copy, Debug)]
+pub struct PotionDef {
+    pub id: &'static str,
+    pub name: &'static str,
+    pub effects: &'static [(&'static str, i32, i32)],
+}
+const fn p(
+    id: &'static str,
+    name: &'static str,
+    effects: &'static [(&'static str, i32, i32)],
+) -> PotionDef {
+    PotionDef { id, name, effects }
+}
+/// `Potions` in registration order.
+pub const POTIONS: &[PotionDef] = &[
+    p("water", "water", &[]),
+    p("mundane", "mundane", &[]),
+    p("thick", "thick", &[]),
+    p("awkward", "awkward", &[]),
+    p("night_vision", "night_vision", &[("night_vision", 3600, 0)]),
+    p(
+        "long_night_vision",
+        "night_vision",
+        &[("night_vision", 9600, 0)],
+    ),
+    p("invisibility", "invisibility", &[("invisibility", 3600, 0)]),
+    p(
+        "long_invisibility",
+        "invisibility",
+        &[("invisibility", 9600, 0)],
+    ),
+    p("leaping", "leaping", &[("jump_boost", 3600, 0)]),
+    p("long_leaping", "leaping", &[("jump_boost", 9600, 0)]),
+    p("strong_leaping", "leaping", &[("jump_boost", 1800, 1)]),
+    p(
+        "fire_resistance",
+        "fire_resistance",
+        &[("fire_resistance", 3600, 0)],
+    ),
+    p(
+        "long_fire_resistance",
+        "fire_resistance",
+        &[("fire_resistance", 9600, 0)],
+    ),
+    p("swiftness", "swiftness", &[("speed", 3600, 0)]),
+    p("long_swiftness", "swiftness", &[("speed", 9600, 0)]),
+    p("strong_swiftness", "swiftness", &[("speed", 1800, 1)]),
+    p("slowness", "slowness", &[("slowness", 1800, 0)]),
+    p("long_slowness", "slowness", &[("slowness", 4800, 0)]),
+    p("strong_slowness", "slowness", &[("slowness", 400, 3)]),
+    p(
+        "turtle_master",
+        "turtle_master",
+        &[("slowness", 400, 3), ("resistance", 400, 2)],
+    ),
+    p(
+        "long_turtle_master",
+        "turtle_master",
+        &[("slowness", 800, 3), ("resistance", 800, 2)],
+    ),
+    p(
+        "strong_turtle_master",
+        "turtle_master",
+        &[("slowness", 400, 5), ("resistance", 400, 3)],
+    ),
+    p(
+        "water_breathing",
+        "water_breathing",
+        &[("water_breathing", 3600, 0)],
+    ),
+    p(
+        "long_water_breathing",
+        "water_breathing",
+        &[("water_breathing", 9600, 0)],
+    ),
+    p("healing", "healing", &[("instant_health", 1, 0)]),
+    p("strong_healing", "healing", &[("instant_health", 1, 1)]),
+    p("harming", "harming", &[("instant_damage", 1, 0)]),
+    p("strong_harming", "harming", &[("instant_damage", 1, 1)]),
+    p("poison", "poison", &[("poison", 900, 0)]),
+    p("long_poison", "poison", &[("poison", 1800, 0)]),
+    p("strong_poison", "poison", &[("poison", 432, 1)]),
+    p("regeneration", "regeneration", &[("regeneration", 900, 0)]),
+    p(
+        "long_regeneration",
+        "regeneration",
+        &[("regeneration", 1800, 0)],
+    ),
+    p(
+        "strong_regeneration",
+        "regeneration",
+        &[("regeneration", 450, 1)],
+    ),
+    p("strength", "strength", &[("strength", 3600, 0)]),
+    p("long_strength", "strength", &[("strength", 9600, 0)]),
+    p("strong_strength", "strength", &[("strength", 1800, 1)]),
+    p("weakness", "weakness", &[("weakness", 1800, 0)]),
+    p("long_weakness", "weakness", &[("weakness", 4800, 0)]),
+    p("luck", "luck", &[("luck", 6000, 0)]),
+    p("slow_falling", "slow_falling", &[("slow_falling", 1800, 0)]),
+    p(
+        "long_slow_falling",
+        "slow_falling",
+        &[("slow_falling", 4800, 0)],
+    ),
+    p("wind_charged", "wind_charged", &[("wind_charged", 3600, 0)]),
+    p("weaving", "weaving", &[("weaving", 3600, 0)]),
+    p("oozing", "oozing", &[("oozing", 3600, 0)]),
+    p("infested", "infested", &[("infested", 3600, 0)]),
+];
+pub fn potion(id: &str) -> Option<&'static PotionDef> {
+    let id = id.trim_start_matches("minecraft:");
+    POTIONS.iter().find(|p| p.id == id)
+}
+/// `PotionContents.BASE_POTION_COLOR` (ARGB -13083194) as RGB.
+pub const BASE_POTION_COLOR: u32 = 0x385DC6;
+/// `PotionContents.getColor`: amplifier-weighted mix of visible effect colours.
+pub fn potion_color(id: Option<&str>) -> u32 {
+    let Some(def) = id.and_then(potion) else {
+        return BASE_POTION_COLOR;
+    };
+    let (mut r, mut g, mut b, mut total) = (0u32, 0u32, 0u32, 0u32);
+    for (e, _, amp) in def.effects {
+        let Some(e) = effect(e) else { continue };
+        let w = *amp as u32 + 1;
+        r += w * (e.color >> 16 & 255);
+        g += w * (e.color >> 8 & 255);
+        b += w * (e.color & 255);
+        total += w;
+    }
+    match (
+        r.checked_div(total),
+        g.checked_div(total),
+        b.checked_div(total),
+    ) {
+        (Some(r), Some(g), Some(b)) => (r << 16) | (g << 8) | b,
+        _ => BASE_POTION_COLOR,
+    }
+}
@@ -0,0 +1,188 @@
+//! Registry contents and source state that commands validate and complete
+//! arguments against (what the server's registry access holds).
+use std::collections::BTreeMap;
+
+/// Registry contents and source state used to validate and complete arguments.
+#[derive(Clone, Debug, Default)]
+pub struct Registries {
+    /// Permission level of the command source.
+    pub permission: u8,
+    pub items: Vec<String>,
+    pub item_tags: Vec<String>,
+    /// Block id -> (property, allowed values).
+    pub blocks: BTreeMap<String, Vec<(String, Vec<String>)>>,
+    pub block_tags: Vec<String>,
+    /// Entity types that `summon` can create.
+    pub summonable: Vec<String>,
+    /// Every entity type (selector `type=`).
+    pub entity_types: Vec<String>,
+    pub effects: Vec<String>,
+    pub enchantments: Vec<String>,
+    pub structures: Vec<String>,
+    pub biomes: Vec<String>,
+    pub dimensions: Vec<String>,
+    pub clocks: Vec<String>,
+    pub timelines: Vec<String>,
+    pub time_markers: Vec<String>,
+    pub advancements: Vec<String>,
+    /// Game rule name -> integer-valued.
+    pub game_rules: Vec<(String, bool)>,
+    pub players: Vec<String>,
+    /// Scoreboard objective names, team names and tracked score holders.
+    pub objectives: Vec<String>,
+    pub teams: Vec<String>,
+    pub tracked: Vec<String>,
+    /// Loaded datapack functions (`ns:path`) and function tags (`ns:path`).
+    pub functions: Vec<String>,
+    /// `/data ... storage` ids.
+    pub storages: Vec<String>,
+    /// Boss bar ids and datapack predicate ids.
+    pub bossbars: Vec<String>,
+    pub predicates: Vec<String>,
+    pub item_modifiers: Vec<String>,
+    pub schedules: Vec<String>,
+    pub stopwatches: Vec<String>,
+    pub recipes: Vec<String>,
+    pub sounds: Vec<String>,
+    pub damage_types: Vec<String>,
+    pub attributes: Vec<String>,
+    pub loot_tables: Vec<String>,
+    pub templates: Vec<String>,
+    pub random_sequences: Vec<String>,
+    pub datapacks_enabled: Vec<String>,
+    pub datapacks_disabled: Vec<String>,
+    pub function_tags: Vec<String>,
+    /// The block the source is looking at (relevant coordinates).
+    pub target_block: Option<[i32; 3]>,
+    /// Every registry's element and tag ids (`minecraft:item` -> ...), as
+    /// the server's registry access and reloadable registries hold them.
+    pub by_registry: BTreeMap<String, RegistryIds>,
+    /// Blocks whose default state has a block entity.
+    pub block_entities: std::collections::BTreeSet<String>,
+    /// Block tag -> member blocks.
+    pub block_tag_members: BTreeMap<String, Vec<String>>,
+    /// Data component types with a codec (not transient).
+    pub persistent_components: Vec<String>,
+    /// Recipes `/recipe` can give (not special).
+    pub learnable_recipes: Vec<String>,
+    /// Advancement id -> criterion names.
+    pub advancement_criteria: BTreeMap<String, Vec<String>>,
+    /// World clock -> time markers shown in commands.
+    pub clock_time_markers: BTreeMap<String, Vec<String>>,
+    /// Trigger objectives the source may use (`/trigger` suggestions).
+    pub trigger_objectives: Vec<String>,
+    /// Objectives with the `trigger` criterion -> holder -> whether its score is locked.
+    pub trigger_scores: BTreeMap<String, BTreeMap<String, bool>>,
+}
+/// The ids and tag ids of one registry.
+#[derive(Clone, Debug, Default)]
+pub struct RegistryIds {
+    pub ids: Vec<String>,
+    pub tags: Vec<String>,
+}
+const EMPTY: &[String] = &[];
+impl Registries {
+    /// Fill what the game did not build itself from vanilla's exported
+    /// registries (`command-registries.json`, written by
+    /// `VanillaCommandParseOracle registries`): built-in registries such as
+    /// mob effects, data component types and dialogs, block entities and tag
+    /// members. Registries that data packs reload stay with the game.
+    pub fn fill_from_export(&mut self, r: &serde_json::Value) {
+        fn strings(v: &serde_json::Value) -> Vec<String> {
+            v.as_array()
+                .map(|a| {
+                    a.iter()
+                        .filter_map(|x| x.as_str().map(str::to_owned))
+                        .collect()
+                })
+                .unwrap_or_default()
+        }
+        let fill = |field: &mut Vec<String>, key: &str| {
+            if field.is_empty() {
+                *field = strings(&r[key]);
+            }
+        };
+        fill(&mut self.effects, "effects");
+        fill(&mut self.enchantments, "enchantments");
+        fill(&mut self.attributes, "attributes");
+        fill(&mut self.damage_types, "damage_types");
+        fill(&mut self.templates, "templates");
+        fill(&mut self.persistent_components, "persistent_components");
+        fill(&mut self.learnable_recipes, "learnable_recipes");
+        const RELOADED: [&str; 5] = [
+            "minecraft:advancement",
+            "minecraft:recipe",
+            "minecraft:loot_table",
+            "minecraft:predicate",
+            "minecraft:item_modifier",
+        ];
+        for (name, entry) in r["by_registry"].as_object().into_iter().flatten() {
+            if RELOADED.contains(&name.as_str()) || self.by_registry.contains_key(name) {
+                continue;
+            }
+            self.by_registry.insert(
+                name.clone(),
+                RegistryIds {
+                    ids: strings(&entry["ids"]),
+                    tags: strings(&entry["tags"]),
+                },
+            );
+        }
+        if self.block_entities.is_empty() {
+            self.block_entities = strings(&r["block_entities"]).into_iter().collect();
+        }
+        if self.block_tag_members.is_empty() {
+            for (tag, members) in r["block_tag_members"].as_object().into_iter().flatten() {
+                self.block_tag_members.insert(tag.clone(), strings(members));
+            }
+        }
+        if self.clock_time_markers.is_empty() {
+            for (clock, markers) in r["clock_time_markers"].as_object().into_iter().flatten() {
+                self.clock_time_markers
+                    .insert(clock.clone(), strings(markers));
+            }
+        }
+        if self.advancement_criteria.is_empty() {
+            for (id, criteria) in r["advancement_criteria"].as_object().into_iter().flatten() {
+                self.advancement_criteria
+                    .insert(id.clone(), strings(criteria));
+            }
+        }
+    }
+    /// The element ids of a registry (sorted).
+    pub fn ids(&self, registry: &str) -> &[String] {
+        if let Some(r) = self.by_registry.get(registry) {
+            return &r.ids;
+        }
+        match registry {
+            "minecraft:item" => &self.items,
+            "minecraft:entity_type" => &self.entity_types,
+            "minecraft:mob_effect" => &self.effects,
+            "minecraft:enchantment" => &self.enchantments,
+            "minecraft:worldgen/structure" => &self.structures,
+            "minecraft:worldgen/biome" => &self.biomes,
+            "minecraft:world_clock" => &self.clocks,
+            "minecraft:timeline" => &self.timelines,
+            "minecraft:attribute" => &self.attributes,
+            "minecraft:damage_type" => &self.damage_types,
+            "minecraft:sound_event" => &self.sounds,
+            "minecraft:predicate" => &self.predicates,
+            "minecraft:item_modifier" => &self.item_modifiers,
+            "minecraft:loot_table" => &self.loot_tables,
+            "minecraft:recipe" => &self.recipes,
+            "minecraft:advancement" => &self.advancements,
+            _ => EMPTY,
+        }
+    }
+    /// The tag ids of a registry (sorted).
+    pub fn tags(&self, registry: &str) -> &[String] {
+        if let Some(r) = self.by_registry.get(registry) {
+            return &r.tags;
+        }
+        match registry {
+            "minecraft:item" => &self.item_tags,
+            "minecraft:block" => &self.block_tags,
+            _ => EMPTY,
+        }
+    }
+}
@@ -2,9 +2,9 @@
 //! `ObjectiveCriteria`, `NumberFormat`) and its saved data
 //! (`data/minecraft/scoreboard.dat`, `ScoreboardSaveData.Packed`).
 use crate::{
-    command::Registries,
    component,
    fastutil_order::{HashSetOrder, OpenOrder},
+    registries::Registries,
    text::{self, Style, Text},
 };
 use horizon_world::nbt::Tag;
@@ -1266,7 +1266,7 @@ fn entity_uuids(tag: &mut Tag) {
                            })
                            .collect::<Option<Vec<i32>>>(),
                        Tag::String(s) => {
-                            crate::save::uuid_from_text(&s.to_string_lossy()).map(Vec::from)
+                            crate::uuid::uuid_from_text(&s.to_string_lossy()).map(Vec::from)
                        }
                        _ => None,
                    };
@@ -0,0 +1,7 @@
+//! Sound sources (`SoundSource`), by name.
+
+/// SoundSource names in vanilla order.
+pub const SOUND_SOURCES: [&str; 11] = [
+    "master", "music", "record", "weather", "block", "hostile", "neutral", "player", "ambient",
+    "voice", "ui",
+];
@@ -42,7 +42,13 @@ pub fn named_color(name: &str) -> Option<u32> {
 /// Click actions carried by locally constructed text components.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum ClickEvent {
+    /// `ClickEvent.OpenUrl`: an http or https link.
+    OpenUrl(String),
+    /// `ClickEvent.ChangePage`: a book's page, counted from 1.
+    ChangePage(i32),
    SuggestCommand(String),
+    /// `ClickEvent.RunCommand`: the command, with or without its `/`.
+    RunCommand(String),
    CopyToClipboard(String),
    /// A local file to open with the system handler.
    /// Only allow this in locally constructed messages, never server/LAN text.
@@ -61,13 +67,17 @@ pub struct Style {
    pub click: Option<ClickEvent>,
    /// Hover text.
    pub hover: Option<Box<Text>>,
+    /// `HoverEvent.ShowItem`: the event's `{id, count?, components?}` object.
+    pub hover_item: Option<Box<Value>>,
+    /// `Style.insertion`: the text a Shift-click puts in the chat box.
+    pub insertion: Option<String>,
    /// The font (`FontDescription.Resource`), a full id like
    /// `minecraft:alt`; the default font when unset.
    pub font: Option<String>,
 }
 /// A style's `font` field: an identifier (`alt` is `minecraft:alt`).
 pub fn font_id(v: &Value) -> Option<String> {
-    crate::command::args::parse_identifier(v.as_str()?)
+    crate::identifier::parse_identifier(v.as_str()?)
 }
 impl Style {
    pub fn color(c: u32) -> Self {
@@ -90,6 +100,12 @@ impl Style {
        if self.hover.is_none() {
            self.hover.clone_from(&base.hover);
        }
+        if self.hover_item.is_none() {
+            self.hover_item.clone_from(&base.hover_item);
+        }
+        if self.insertion.is_none() {
+            self.insertion.clone_from(&base.insertion);
+        }
        if self.font.is_none() {
            self.font.clone_from(&base.font);
        }
@@ -495,7 +511,7 @@ impl Text {
 }

 /// The style fields of a component's JSON.
-const STYLE_KEYS: [&str; 9] = [
+const STYLE_KEYS: [&str; 10] = [
    "color",
    "bold",
    "italic",
@@ -504,6 +520,7 @@ const STYLE_KEYS: [&str; 9] = [
    "obfuscated",
    "click_event",
    "hover_event",
+    "insertion",
    "font",
 ];
 /// Style.Serializer: the fields a style sets.
@@ -529,12 +546,17 @@ fn style_json(style: &Style) -> Vec<(String, Value)> {
    }
    if let Some(click) = &style.click {
        let event = match click {
+            ClickEvent::OpenUrl(url) => json!({ "action": "open_url", "url": url }),
+            ClickEvent::ChangePage(page) => json!({ "action": "change_page", "page": page }),
            ClickEvent::SuggestCommand(command) => {
                json!({ "action": "suggest_command", "command": command })
            }
            ClickEvent::CopyToClipboard(value) => {
                json!({ "action": "copy_to_clipboard", "value": value })
            }
+            ClickEvent::RunCommand(command) => {
+                json!({ "action": "run_command", "command": command })
+            }
            ClickEvent::OpenFile(path) => json!({ "action": "open_file", "path": path }),
        };
        out.push(("click_event".to_owned(), event));
@@ -544,6 +566,13 @@ fn style_json(style: &Style) -> Vec<(String, Value)> {
            "hover_event".to_owned(),
            json!({ "action": "show_text", "value": hover.component() }),
        ));
+    } else if let Some(Value::Object(item)) = style.hover_item.as_deref() {
+        let mut event = item.clone();
+        event.insert("action".into(), "show_item".into());
+        out.push(("hover_event".to_owned(), Value::Object(event)));
+    }
+    if let Some(insertion) = &style.insertion {
+        out.push(("insertion".to_owned(), insertion.clone().into()));
    }
    if let Some(font) = &style.font {
        out.push(("font".to_owned(), font.clone().into()));
@@ -0,0 +1,24 @@
+//! UUIDs as vanilla's four-int form, to and from their text form.
+
+pub fn uuid_text(u: [i32; 4]) -> String {
+    let hex: String = u.iter().map(|v| format!("{:08x}", *v as u32)).collect();
+    format!(
+        "{}-{}-{}-{}-{}",
+        &hex[0..8],
+        &hex[8..12],
+        &hex[12..16],
+        &hex[16..20],
+        &hex[20..32]
+    )
+}
+pub fn uuid_from_text(s: &str) -> Option<[i32; 4]> {
+    let hex: String = s.chars().filter(|c| *c != '-').collect();
+    if hex.len() != 32 {
+        return None;
+    }
+    let mut out = [0i32; 4];
+    for (i, v) in out.iter_mut().enumerate() {
+        *v = u32::from_str_radix(&hex[i * 8..i * 8 + 8], 16).ok()? as i32;
+    }
+    Some(out)
+}
@@ -0,0 +1,8 @@
+//! Who an action came from or is aimed at: the player or a mob by id.
+
+/// Who caused damage or is being targeted.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum Who {
+    Player,
+    Mob(u32),
+}
@@ -9,6 +9,9 @@ description = "Horizon native development client"

 [dependencies]
 horizon-assets = { path = "../horizon-assets" }
+horizon-client-core = { path = "../horizon-client-core" }
+horizon-command = { path = "../horizon-command" }
+horizon-items = { path = "../horizon-items" }
 horizon-core = { path = "../horizon-core" }
 # The server thread ahead of the workers (MinecraftServer.spin's Thread.setPriority).
 horizon-threads = { path = "../horizon-threads" }
@@ -60,6 +63,7 @@ gilrs = { version = "0.11", optional = true }
 horizon-dualsense = { path = "../horizon-dualsense", optional = true }
 # HTTPS to the Minecraft services (online-mode session join).
 ureq = { version = "2", default-features = false, features = ["tls"] }
+unicode-bidi = "0.3.18"

 [target.'cfg(unix)'.dependencies]
 # The server thread's CPU time per tick (`HORIZON_SPIKES`, spans.rs).
@@ -102,5 +106,6 @@ path = "examples/probe/main.rs"
 workspace = true

 [dev-dependencies]
+horizon-items = { path = "../horizon-items", features = ["test-support"] }
 # Every WGSL shader translated as wgpu's DirectX 12 backend does (gfx.rs tests).
 naga = { version = "30.0.1", features = ["wgsl-in", "hlsl-out", "msl-out", "spv-out"] }
@@ -2,7 +2,7 @@
 //! Build with `cargo build --release -p horizon-client --example gameplay_decode_profile`.
 //! Each invocation runs one phase in a separate process for CPU/RSS measurements.
 #[allow(dead_code)]
-#[path = "../src/blocks/decode.rs"]
+#[path = "../../horizon-items/src/blocks/decode.rs"]
 mod decode;

 use std::{hint::black_box, path::Path, time::Instant};
@@ -163,6 +163,8 @@ pub fn main() -> Result<()> {
                                    ArrowSound::HitGround => "hit",
                                    ArrowSound::Splash => "splash",
                                    ArrowSound::Extinguish => "extinguish",
+                                    ArrowSound::TridentHitGround => "trident_hit_ground",
+                                    ArrowSound::TridentHit => "trident_hit",
                                },
                                volume.to_bits(),
                                pitch.to_bits()
@@ -0,0 +1,48 @@
+use horizon_client::{
+    Result,
+    item_data::StackData,
+    items::{ItemStack, Items},
+};
+use horizon_world::nbt::Tag;
+use serde_json::Value;
+use std::{
+    fs::File,
+    io::{BufRead, BufReader, BufWriter, Write},
+    path::Path,
+};
+
+pub fn main() -> Result<()> {
+    let args: Vec<_> = crate::args().collect();
+    let root = Path::new(env!("CARGO_MANIFEST_DIR")).join("../../.local/horizon-client/26.3");
+    let items = Items::catalog(&root)?;
+    let mut out = BufWriter::new(File::create(&args[2])?);
+    for line in BufReader::new(File::open(&args[1])?).lines() {
+        let row: Value = serde_json::from_str(&line?)?;
+        let mut stack = ItemStack::new(
+            row["item"].as_str().unwrap(),
+            row["count"].as_u64().unwrap() as u32,
+        );
+        match row["tool"].as_str().unwrap() {
+            "default" => {}
+            mode => {
+                let mut data = StackData::default();
+                let tool = if mode == "implicit" {
+                    Tag::compound([] as [(&str, Tag); 0])
+                } else {
+                    Tag::compound([(
+                        "can_destroy_blocks_in_creative",
+                        Tag::Byte(i8::from(mode == "allow")),
+                    )])
+                };
+                data.set_other("minecraft:tool", Some(tool));
+                stack.extra = Some(Box::new(data));
+            }
+        }
+        writeln!(
+            out,
+            "{}",
+            items.can_destroy_block(Some(&stack), row["creative"].as_bool().unwrap())
+        )?;
+    }
+    Ok(())
+}
@@ -54,7 +54,7 @@ pub fn main() -> Result<()> {
            match c["axis"].as_i64() {
                Some(axis @ 0..=2) => {
                    let line = record("electric_spark");
-                    particles::along_axis(&mut random, axis as usize, p, |p, v| {
+                    particles::along_axis(&mut random, axis as usize, p, (10, 19), |p, v| {
                        lines.push(line(p, v))
                    });
                }
@@ -592,6 +592,7 @@ pub fn main() -> horizon_client::Result<()> {
                    pose,
                    num("maxCrossbowChageDuration"),
                    num("ticksUsingItem"),
+                    false,
                );
            }
            Species::Evoker | Species::Illusioner | Species::Pillager | Species::Vindicator => {
@@ -23,6 +23,8 @@ fn stack(spec: &str) -> LootStack {
        map: false,
        exploration: None,
        ominous_amplifier: None,
+        stew_effects: Vec::new(),
+        names: Vec::new(),
    };
    for e in parts {
        let (name, level) = e.rsplit_once(':').unwrap_or((e, "1"));
@@ -154,11 +154,11 @@ const MEMORIES: [&str; 7] = [
 fn variant(m: &Mob, regs: &SpawnRegistries, v: &mut Vec<String>) {
    use Species as S;
    let s = m.species();
-    let named = |reg: &finalize::VariantRegistry, i: u8| {
-        format!(
-            "minecraft:{}",
+    let named = |reg: &finalize::VariantRegistry, i: Option<u8>| {
+        let name = i.map_or("classic", |i| {
            reg.names.get(i as usize).map_or("?", |n| n.as_str())
-        )
+        });
+        format!("minecraft:{name}")
    };
    let var = format!("minecraft:{}", finalize::variant_name(s, m.extra.variant));
    match s {
@@ -223,6 +223,7 @@ fn decorations(c: &Value, atlas: &HudAtlas) -> Vec<GuiDraw> {
            display_health: int("displayHealth", 0),
            last_health_time: millis - i64::from(int("lastHealthAgo", 0)),
            health_blink_time: i64::from(int("healthBlinkTime", 0)),
+            ..HealthHud::default()
        };
        let kind = if has("minecraft:poison") {
            HeartKind::Poisoned
@@ -101,7 +101,7 @@ fn title(c: &Value, w: i32, h: i32, atlas: &HudAtlas) -> Vec<GuiDraw> {
    }
    let partial = float(c, "partial", 0.0);
    let bg = background(c);
-    let mut out = t.overlay_message(w, h, partial, &atlas.font, bg);
+    let mut out = t.overlay_message(w, h, 39, partial, &atlas.font, bg);
    out.extend(t.title(w, h, partial, &atlas.font, bg));
    out
 }
@@ -129,7 +129,7 @@ fn selected(c: &Value, w: i32, h: i32, atlas: &HudAtlas) -> Vec<GuiDraw> {
    }
    let mode = c["gameMode"].as_str().unwrap_or("survival");
    let can_hurt = mode == "survival" || mode == "adventure";
-    highlight.draw(w, h, can_hurt, &atlas.font, background(c))
+    highlight.draw(w, h, 39, can_hurt, &atlas.font, background(c))
 }

 fn boss(c: &Value, w: i32, h: i32, atlas: &HudAtlas) -> Vec<GuiDraw> {
@@ -27,6 +27,7 @@ mod chat_screen_fixture;
 mod cloud_fixture;
 mod command_parse_fixture;
 mod container_screen_probe;
+mod creative_mining_probe;
 mod creative_search_fixture;
 mod cushion_placement_probe;
 mod emitter_particles_probe;
@@ -84,6 +85,7 @@ mod sound_engine_fixture;
 mod sound_event_fixture;
 mod spawn_rules_fixture;
 mod sprint_probe;
+mod squid_client_probe;
 mod subtitle_fixture;
 mod tab_list_fixture;
 mod team_rules_fixture;
@@ -108,6 +110,8 @@ probes! {
    block_transform_fixture,
    breaking_fixture,
    camera_probe,
+    squid_client_probe,
+    creative_mining_probe,
    cushion_placement_probe,
    cauldron_fixture,
    chat_screen_fixture,
@@ -74,7 +74,14 @@ pub fn main() -> Result<()> {
            biomes: &biomes,
            registry: assets.registry,
            raining_at: &|_| false,
+            height_no_leaves: &|_| 0,
+            firefly_bush_sounds: false,
+            sky_darken: 0,
            marker: target.map(|name| (name, &options as &dyn Fn(_) -> _)),
+            model_offset: &|_, _, _| None,
+            gateway_particles: &|_, _| 0,
+            thundering: false,
+            ultrawarm: false,
        };
        engine.seed_randoms(1057, 0, 0);
        engine.requested = Some(Vec::new());
@@ -567,7 +567,13 @@ fn print_heart(
 /// The damage of a mob's direct hit on the player (others count as none).
 fn player_damage(e: &MobEvent) -> f32 {
    match e {
-        MobEvent::AttackPlayer(amount, _) | MobEvent::DamagePlayer { amount, .. } => *amount,
+        MobEvent::AttackPlayer(amount, _)
+        | MobEvent::AttackPlayerWithEffect { amount, .. }
+        | MobEvent::DamagePlayer { amount, .. } => *amount,
+        MobEvent::SonicBoom {
+            target: Who::Player,
+            ..
+        } => 10.0,
        _ => 0.0,
    }
 }
@@ -578,9 +584,15 @@ fn player_hurt(player: Option<&PlayerView>, e: &MobEvent) -> bool {
        return false;
    };
    match e {
-        MobEvent::AttackPlayer(amount, _) | MobEvent::DamagePlayer { amount, .. } => *amount > 0.0,
+        MobEvent::AttackPlayer(amount, _)
+        | MobEvent::AttackPlayerWithEffect { amount, .. }
+        | MobEvent::DamagePlayer { amount, .. } => *amount > 0.0,
+        MobEvent::SonicBoom {
+            target: Who::Player,
+            ..
+        } => true,
        // ServerExplosion.hurtEntities: within twice the radius every hit does damage.
-        MobEvent::Explode(at, radius) => {
+        MobEvent::Explode(at, radius, _) => {
            let d = Vec3::new(at[0], at[1], at[2])
                .distance_squared(p.position)
                .sqrt();
@@ -1045,21 +1057,29 @@ pub fn main() -> horizon_client::Result<()> {
                alive: true,
                creative: s.creative,
                sneaking: false,
+                swimming: false,
                look: [0.0, 0.0, 1.0],
                main_hand: s.hand.as_deref().map(Into::into),
                off_hand: None,
                head: None,
                armor_cover: 0.0,
+                invisible: false,
                spectator: false,
                gold_armor: false,
                hurt_by: None,
                last_hurt: None,
                velocity: Vec3::ZERO,
                yaw: 0.0,
+                sprinting: false,
+                riding: false,
                hero: false,
+                effects: Vec::new(),
                uuid: PLAYER_UUID,
                allies: Default::default(),
                remote: false,
+                sleeping: false,
+                sleep_timer: 0,
+                passenger: false,
            }
        });
        let mut scratch = LegacyRandom::new(0);
@@ -1069,6 +1089,8 @@ pub fn main() -> horizon_client::Result<()> {
        for (i, m) in mobs.iter().enumerate() {
            print(&mut out, 0, i, m, s.creative, world.game_time);
        }
+        // No player has a chest open in the scenarios.
+        let lid_openers = std::collections::HashMap::new();
        // The MobWorld every step sees, over a snapshot of the mobs.
        macro_rules! mob_world {
            ($snapshot:expr) => {
@@ -1080,6 +1102,7 @@ pub fn main() -> horizon_client::Result<()> {
                    world: &world,
                    registry,
                    facts: &facts,
+                    fluid_tables: &motion.fluids,
                    movement: &motion.blocks,
                    collision: &collision,
                    data: &data,
@@ -1097,12 +1120,14 @@ pub fn main() -> horizon_client::Result<()> {
                    block_tags: &items.block_tags,
                    biomes: &biomes,
                    mob_griefing: true,
+                    mob_drops: true,
                    difficulty: LocalDifficulty::new(s.difficulty, world.day_time, 0, 0.0),
                    end: false,
                    world_seed: 0,
                    // FlatLevelSource.getSeaLevel.
                    sea_level: -63,
                    items: Some(&items),
+                    lid_openers: &lid_openers,
                }
            };
        }
@@ -5,6 +5,10 @@
 //!
 //! usage: recipe_book_fixture RESOURCES CASES OUTPUT
 use horizon_client::recipe_book::{BookType, RecipeIndex, Settings};
+use horizon_protocol::{
+    buf::{Codec, Reader, Writer},
+    packets::recipes::RecipeBookChangeSettings,
+};
 use horizon_world::nbt::Tag;
 use serde_json::Value;
 use std::{collections::BTreeSet, fs, path::Path};
@@ -93,8 +97,23 @@ pub fn main() -> horizon_client::Result<()> {
                        _ => BookType::Smoker,
                    }
                    .index();
-                    book.open[i] = op["open"].as_bool().unwrap_or(false);
-                    book.filtering[i] = op["filtering"].as_bool().unwrap_or(false);
+                    let packet = RecipeBookChangeSettings {
+                        book_type: i as i32,
+                        open: op["open"].as_bool().unwrap_or(false),
+                        filtering: op["filtering"].as_bool().unwrap_or(false),
+                    };
+                    let mut wire = Writer::new();
+                    RecipeBookChangeSettings::write(&packet, &mut wire);
+                    extra = format!(
+                        " packet={}",
+                        wire.data
+                            .iter()
+                            .map(|b| format!("{b:02x}"))
+                            .collect::<String>()
+                    );
+                    let decoded = RecipeBookChangeSettings::read(&mut Reader::new(&wire.data))?;
+                    book.open[decoded.book_type as usize] = decoded.open;
+                    book.filtering[decoded.book_type as usize] = decoded.filtering;
                }
                "save" => {
                    let tag = book.write();
@@ -164,6 +164,8 @@ fn snapshot(out: &mut impl Write, player: &PlayerMotion) -> Result<()> {
        .iter()
        .filter_map(|e| match e {
            MotionEvent::Fall(e) => Some(e.trace()),
+            // The oracle's player wears no armor; the game applies this one.
+            MotionEvent::Health(horizon_client::health::HealthEvent::ArmorHurt { .. }) => None,
            MotionEvent::Health(e) => Some(e.trace()),
            MotionEvent::Snowflake { position, velocity } => Some(format!(
                "snowflake {:016x},{:016x},{:016x} {:016x},{:016x},{:016x}",
@@ -206,7 +208,7 @@ fn snapshot(out: &mut impl Write, player: &PlayerMotion) -> Result<()> {
            )),
            MotionEvent::Emission {
                state,
-                in_water: true,
+                muffled: true,
                ..
            } => Some(format!("muffled-step {}", state.0)),
            MotionEvent::BubbleColumnParticle { bubble, position } => Some(format!(
@@ -351,6 +353,7 @@ pub fn main() -> Result<()> {
                            horizon_world::food::Difficulty::Hard,
                        ][op["difficulty"].as_u64().unwrap() as usize],
                        natural_regeneration: op["regenerate"].as_bool().unwrap(),
+                        ..Default::default()
                    };
                }
                "food" => {
@@ -0,0 +1,51 @@
+use horizon_client::{
+    Result,
+    mobs::{Mob, MobTypes, aquatic},
+};
+use horizon_core::geometry::Vec3;
+use serde_json::Value;
+use std::{
+    fs::File,
+    io::{BufRead, BufReader, BufWriter, Write},
+    path::Path,
+    sync::Arc,
+};
+
+pub fn main() -> Result<()> {
+    let args: Vec<_> = crate::args().collect();
+    let root = Path::new(env!("CARGO_MANIFEST_DIR")).join("../../.local/horizon-client/26.3");
+    let types = MobTypes::load(&root)?;
+    let mut out = BufWriter::new(File::create(&args[2])?);
+    for line in BufReader::new(File::open(&args[1])?).lines() {
+        let row: Value = serde_json::from_str(&line?)?;
+        let kind = Arc::new(
+            types.types[&format!("minecraft:{}", row["species"].as_str().unwrap())].clone(),
+        );
+        let mut mob = Mob::new(1, kind, Vec3::ZERO, 0.0);
+        mob.fluids.in_water = row["water"].as_bool().unwrap();
+        mob.velocity = Vec3::new(
+            row["x"].as_f64().unwrap(),
+            row["y"].as_f64().unwrap(),
+            row["z"].as_f64().unwrap(),
+        );
+        mob.body_yaw = row["body"].as_f64().unwrap() as f32;
+        for (i, value) in row["v"].as_array().unwrap().iter().enumerate() {
+            mob.anim.v[i] = value.as_f64().unwrap() as f32;
+        }
+        if row["reset"].as_bool().unwrap() {
+            aquatic::squid_cycle_event(&mut mob);
+        }
+        let velocity = mob.velocity;
+        aquatic::squid_client_step(&mut mob);
+        assert_eq!(
+            velocity, mob.velocity,
+            "a remote animation must preserve packet velocity"
+        );
+        write!(out, "{:08x}", mob.body_yaw.to_bits())?;
+        for value in &mob.anim.v[..6] {
+            write!(out, " {:08x}", value.to_bits())?;
+        }
+        writeln!(out)?;
+    }
+    Ok(())
+}
@@ -4,7 +4,7 @@
 //! conditions advancements use).
 use serde_json::Value;
 use std::{
-    collections::{BTreeMap, HashMap},
+    collections::{BTreeMap, BTreeSet, HashMap},
    path::Path,
 };

@@ -437,6 +437,8 @@ pub struct EntityView {
    /// mainhand, offhand, head, chest, legs, feet, body.
    pub equipment: [Option<ItemView>; 7],
    pub vehicle: Option<Box<EntityView>>,
+    /// Player: what it looks at within 100 blocks (`PlayerPredicate.lookingAt`).
+    pub looking_at: Option<Box<EntityView>>,
    pub effects: Vec<(String, i32, i32)>,
    /// Player: game mode name.
    pub gamemode: Option<String>,
@@ -458,7 +460,7 @@ fn range_f(v: &Value, x: f64) -> bool {
        _ => false,
    }
 }
-fn range_i(v: &Value, x: i64) -> bool {
+pub fn range_i(v: &Value, x: i64) -> bool {
    range_f(v, x as f64)
 }
 /// A registry id, `#tag`, or list matched against one id.
@@ -473,6 +475,51 @@ pub fn id_matches(v: &Value, registry: &str, id: &str, w: &dyn World) -> bool {
        _ => false,
    }
 }
+/// `PotionsPredicate`: the potion in a `HolderSet`, plus a `CollectionPredicate`
+/// over the potion's effects (`contains`, `count`, `size`).
+pub fn potions(v: &Value, potion: Option<&str>, w: &dyn World) -> bool {
+    if v.is_null() {
+        return true;
+    }
+    if !v["potions"].is_null() && !potion.is_some_and(|p| id_matches(&v["potions"], "potion", p, w))
+    {
+        return false;
+    }
+    let c = &v["effects"];
+    if c.is_null() {
+        return true;
+    }
+    let effects: Vec<(String, i32, i32)> = potion
+        .and_then(crate::brewing::potion)
+        .map(|d| {
+            d.effects
+                .iter()
+                .map(|(id, dur, amp)| (format!("minecraft:{id}"), *amp, *dur))
+                .collect()
+        })
+        .unwrap_or_default();
+    // `MobEffectsPredicate.test`: the one listed effect, amplifier and duration.
+    let test = |pred: &Value, e: &(String, i32, i32)| {
+        pred.as_object().is_some_and(|m| {
+            m.get(&e.0).is_some_and(|want| {
+                range_i(&want["amplifier"], i64::from(e.1))
+                    && range_i(&want["duration"], i64::from(e.2))
+                    && want["ambient"].as_bool().is_none_or(|b| !b)
+                    && want["visible"].as_bool().is_none_or(|b| b)
+            })
+        })
+    };
+    c["contains"]
+        .as_array()
+        .is_none_or(|l| l.iter().all(|p| effects.iter().any(|e| test(p, e))))
+        && c["count"].as_array().is_none_or(|l| {
+            l.iter().all(|entry| {
+                let n = effects.iter().filter(|e| test(&entry["test"], e)).count();
+                range_i(&entry["count"], n as i64)
+            })
+        })
+        && range_i(&c["size"], effects.len() as i64)
+}
 /// `ItemPredicate`.
 pub fn item(v: &Value, it: &ItemView, w: &dyn World) -> bool {
    if v.is_null() {
@@ -614,6 +661,18 @@ fn components(expected: &Value, have: &[(String, String)]) -> bool {
        })
    })
 }
+/// `DistancePredicate.matches` between two points.
+pub fn distance(v: &Value, a: [f64; 3], b: [f64; 3]) -> bool {
+    let d = [a[0] - b[0], a[1] - b[1], a[2] - b[2]];
+    range_f(&v["x"], d[0].abs())
+        && range_f(&v["y"], d[1].abs())
+        && range_f(&v["z"], d[2].abs())
+        && range_f(&v["horizontal"], (d[0] * d[0] + d[2] * d[2]).sqrt())
+        && range_f(
+            &v["absolute"],
+            (d[0] * d[0] + d[1] * d[1] + d[2] * d[2]).sqrt(),
+        )
+}
 /// `EntityPredicate` (26.x keyed sub-predicates).
 pub fn entity(v: &Value, e: &EntityView, w: &dyn World, origin: [f64; 3]) -> bool {
    if v.is_null() {
@@ -629,21 +688,7 @@ pub fn entity(v: &Value, e: &EntityView, w: &dyn World, origin: [f64; 3]) -> boo
            "minecraft:stepping_on" => {
                location(p, [e.position[0], e.position[1] - 0.5, e.position[2]], w)
            }
-            "minecraft:distance" | "distance" => {
-                let d = [
-                    e.position[0] - origin[0],
-                    e.position[1] - origin[1],
-                    e.position[2] - origin[2],
-                ];
-                range_f(&p["x"], d[0].abs())
-                    && range_f(&p["y"], d[1].abs())
-                    && range_f(&p["z"], d[2].abs())
-                    && range_f(&p["horizontal"], (d[0] * d[0] + d[2] * d[2]).sqrt())
-                    && range_f(
-                        &p["absolute"],
-                        (d[0] * d[0] + d[1] * d[1] + d[2] * d[2]).sqrt(),
-                    )
-            }
+            "minecraft:distance" | "distance" => distance(p, e.position, origin),
            "minecraft:flags" | "flags" => {
                let f = |k: &str, have: bool| p[k].as_bool().is_none_or(|want| want == have);
                f("is_on_fire", e.on_fire)
@@ -678,11 +723,16 @@ pub fn entity(v: &Value, e: &EntityView, w: &dyn World, origin: [f64; 3]) -> boo
                    })
                })
            }),
-            "minecraft:type_specific/player" => p["gamemode"].as_array().is_none_or(|modes| {
-                e.gamemode
-                    .as_deref()
-                    .is_some_and(|g| modes.iter().any(|m| m.as_str() == Some(g)))
-            }),
+            "minecraft:type_specific/player" => {
+                p["gamemode"].as_array().is_none_or(|modes| {
+                    e.gamemode
+                        .as_deref()
+                        .is_some_and(|g| modes.iter().any(|m| m.as_str() == Some(g)))
+                }) && (p["looking_at"].is_null()
+                    || e.looking_at
+                        .as_ref()
+                        .is_some_and(|t| entity(&p["looking_at"], t, w, origin)))
+            }
            "minecraft:type_specific/lightning" => {
                range_i(&p["blocks_set_on_fire"], 0)
                    && (p["entity_struck"].is_null()
@@ -703,6 +753,87 @@ pub fn entity(v: &Value, e: &EntityView, w: &dyn World, origin: [f64; 3]) -> boo
    }
    true
 }
+/// `KilledByArrowTrigger.TriggerInstance.matches`: the weapon, each listed
+/// victim condition matched by a distinct victim, and the count of entity types.
+pub fn killed_by_arrow(
+    c: &Value,
+    me: &EntityView,
+    victims: &[EntityView],
+    weapon: Option<&ItemView>,
+    w: &dyn World,
+) -> bool {
+    fn ctx<'a>(e: &'a EntityView, me: &EntityView) -> Entities<'a> {
+        Entities {
+            this: Some(e),
+            origin: me.position,
+            tool: None,
+            block_pos: None,
+        }
+    }
+    if !conditions(&c["player"], &ctx(me, me), w) {
+        return false;
+    }
+    if !c["fired_from_weapon"].is_null()
+        && !weapon.is_some_and(|it| item(&c["fired_from_weapon"], it, w))
+    {
+        return false;
+    }
+    let mut left: Vec<&EntityView> = victims.iter().collect();
+    for want in c["victims"].as_array().into_iter().flatten() {
+        let Some(i) = left.iter().position(|e| conditions(want, &ctx(e, me), w)) else {
+            return false;
+        };
+        left.remove(i);
+    }
+    let kinds: BTreeSet<&str> = victims.iter().map(|e| e.kind.as_str()).collect();
+    range_i(&c["unique_entity_types"], kinds.len() as i64)
+}
+/// A damage event as `DamagePredicate` sees it.
+#[derive(Clone, Debug, Default)]
+pub struct DamageView {
+    /// The damage type id (`minecraft:arrow`).
+    pub kind: String,
+    /// `DamageSource.getDirectEntity` and `getEntity`.
+    pub direct: Option<EntityView>,
+    pub source: Option<EntityView>,
+    /// `DamageSource.isDirect`: the direct entity is the causing one.
+    pub is_direct: bool,
+    /// The damage before and after the shield took its share.
+    pub original: f32,
+    pub actual: f32,
+    pub blocked: bool,
+}
+/// `DamagePredicate`, with its `DamageSourcePredicate` as `type`.
+pub fn damage(v: &Value, d: &DamageView, w: &dyn World, origin: [f64; 3]) -> bool {
+    if v.is_null() {
+        return true;
+    }
+    let by = |key: &str, e: &Option<EntityView>| {
+        v[key].is_null() || e.as_ref().is_some_and(|e| entity(&v[key], e, w, origin))
+    };
+    if !range_f(&v["dealt"], f64::from(d.original))
+        || !range_f(&v["taken"], f64::from(d.actual))
+        || !by("source_entity", &d.source)
+        || v["blocked"].as_bool().is_some_and(|b| b != d.blocked)
+    {
+        return false;
+    }
+    let ty = &v["type"];
+    let tags_ok = ty["tags"].as_array().into_iter().flatten().all(|t| {
+        let tag = t["id"].as_str().unwrap_or("");
+        let tag = tag.strip_prefix('#').unwrap_or(tag);
+        w.in_tag("damage_type", tag, &d.kind) == t["expected"].as_bool().unwrap_or(true)
+    });
+    let direct_ok = ty["direct_entity"].is_null()
+        || d.direct
+            .as_ref()
+            .is_some_and(|e| entity(&ty["direct_entity"], e, w, origin));
+    let source_ok = ty["source_entity"].is_null()
+        || d.source
+            .as_ref()
+            .is_some_and(|e| entity(&ty["source_entity"], e, w, origin));
+    tags_ok && direct_ok && source_ok && ty["is_direct"].as_bool().is_none_or(|b| b == d.is_direct)
+}
 /// The entities a loot-style condition list may refer to.
 pub struct Entities<'a> {
    pub this: Option<&'a EntityView>,
@@ -9,7 +9,7 @@ use crate::{
    collisions::SceneCollisions,
    mobs::Who,
    motion::{FluidResources, LAVA, WATER},
-    projectiles::{Hit, Projectile},
+    projectiles::{Hit, Projectile, ProjectileKind},
    world::World,
 };
 use horizon_core::{
@@ -132,6 +132,10 @@ pub enum ArrowSound {
    HitGround,
    /// `entity.generic.extinguish_fire`.
    Extinguish,
+    /// A thrown trident's `getDefaultHitGroundSoundEvent` (`item.trident.hit_ground`).
+    TridentHitGround,
+    /// `ThrownTrident.onHitEntity`'s `item.trident.hit`.
+    TridentHit,
 }
 /// What a burning arrow does to the block it hits (`onProjectileHit`).
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -155,8 +159,14 @@ pub struct ArrowState {
    pub pickup: Pickup,
    /// `pickupItemStack`: what picking the arrow up gives.
    pub pickup_item: crate::items::ItemStack,
+    /// `AbstractArrow.firedFromWeapon`: the crossbow or bow it was shot from.
+    pub fired_from_weapon: Option<crate::items::ItemStack>,
    pub no_physics: bool,
+    /// `AbstractArrow.getPierceLevel`.
    pub pierce: u8,
+    /// `piercingIgnoreEntityIds`: the entities a piercing arrow has gone
+    /// through (cleared when it sticks in a block).
+    pub pierced: Vec<Who>,
    /// `Entity.remainingFireTicks`.
    pub fire_ticks: i32,
    pub fall_distance: f64,
@@ -165,6 +175,9 @@ pub struct ArrowState {
    pub was_eye_in_water: bool,
    pub first_tick: bool,
    pub has_been_shot: bool,
+    /// `ThrownTrident.dealtDamage`: it has hit an entity (or sat in a block
+    /// for over 4 ticks) and hits no more.
+    pub dealt_damage: bool,
    pub removed: bool,
    /// The arrow's own random (`Entity.random`).
    pub random: LegacyRandom,
@@ -197,8 +210,10 @@ impl ArrowState {
            last_state: None,
            pickup: Pickup::Disallowed,
            pickup_item: crate::items::ItemStack::new("minecraft:arrow", 1),
+            fired_from_weapon: None,
            no_physics: false,
            pierce: 0,
+            pierced: Vec::new(),
            fire_ticks: 0,
            fall_distance: 0.0,
            fluids: EntityFluidInteraction::new([WATER, LAVA]),
@@ -206,6 +221,7 @@ impl ArrowState {
            was_eye_in_water: false,
            first_tick: true,
            has_been_shot: false,
+            dealt_damage: false,
            removed: false,
            random,
            events: Vec::new(),
@@ -362,6 +378,29 @@ fn bounds(at: Vec3) -> Aabb {
        Vec3::new(at.x + w, at.y + f64::from(HEIGHT), at.z + w),
    )
 }
+/// The bounding box of an arrow, or a thrown trident, at `at`.
+pub fn arrow_bounds(at: Vec3) -> Aabb {
+    bounds(at)
+}
+/// The blocks an arrow that moved from `from` to `to` was inside
+/// (`Entity.checkInsideBlocks`: the sweep of its box, 16 steps at most), for
+/// the blocks that react to it (`entityInside`).
+pub fn blocks_inside(from: Vec3, to: Vec3) -> Vec<BlockPos> {
+    let deflated = bounds(to).deflate(Vec3::new(
+        f64::from(1.0e-5f32),
+        f64::from(1.0e-5f32),
+        f64::from(1.0e-5f32),
+    ));
+    let mut inside = Vec::new();
+    let _ = sweep_intersected_blocks(from, to, deflated, 1_000_000, |p, iteration| {
+        if iteration >= 16 {
+            return false;
+        }
+        inside.push(p);
+        true
+    });
+    inside
+}
 /// `Projectile.lerpRotation`.
 fn lerp_rotation(mut old: f32, new: f32) -> f32 {
    while new - old < -180.0 {
@@ -423,18 +462,29 @@ pub fn finish_entity_hit(p: &mut Projectile, scene: &ArrowScene, outcome: Entity
    let Some(mut st) = p.arrow.take() else {
        return false;
    };
+    let trident = matches!(p.kind, ProjectileKind::Trident);
    let mut ticker = Ticker {
        p,
        st: &mut st,
        scene,
    };
    match outcome {
+        EntityHit::Hurt | EntityHit::Refused if trident => ticker.trident_bounce(),
        EntityHit::Hurt => {
            ticker.hit_sound();
-            ticker.st.removed = true;
+            // A piercing arrow flies on (`getPierceLevel() <= 0` discards).
+            if ticker.st.pierce == 0 {
+                ticker.st.removed = true;
+            }
        }
        EntityHit::Refused => ticker.turn_back(),
-        EntityHit::Deflected => {}
+        EntityHit::Deflected => {
+            // The deflection comes before `onHitEntity` adds the entity to
+            // `piercingIgnoreEntityIds`.
+            if ticker.st.pierce > 0 {
+                ticker.st.pierced.pop();
+            }
+        }
    }
    ticker.finish();
    p.stuck = st.in_ground;
@@ -464,7 +514,16 @@ impl Ticker<'_, '_, '_, '_> {
                p.z,
            ))
    }
+    /// Whether this is a `ThrownTrident` (`AbstractArrow` with its own water
+    /// inertia, sounds and hit).
+    fn trident(&self) -> bool {
+        matches!(self.p.kind, ProjectileKind::Trident)
+    }
    fn tick(&mut self, targets: &[(Who, Aabb)]) -> Hit {
+        // ThrownTrident.tick.
+        if self.trident() && self.st.in_ground_time > 4 {
+            self.st.dealt_damage = true;
+        }
        let physics = !self.st.no_physics;
        let movement = self.p.velocity;
        let block_pos = self.block_position();
@@ -512,8 +571,9 @@ impl Ticker<'_, '_, '_, '_> {
        self.st.in_ground_time = 0;
        let original = self.position();
        if self.st.was_touching_water {
-            // getWaterInertia, then the bubbles behind it.
-            self.p.velocity = self.p.velocity.scale(f64::from(0.6f32));
+            // getWaterInertia (0.99 for a trident), then the bubbles behind it.
+            let inertia = if self.trident() { 0.99f32 } else { 0.6f32 };
+            self.p.velocity = self.p.velocity.scale(f64::from(inertia));
            let v = self.p.velocity;
            for _ in 0..4 {
                self.st.events.push(ArrowEvent::Particle {
@@ -639,7 +699,8 @@ impl Ticker<'_, '_, '_, '_> {
        self.st.life = 0;
    }
    /// `AbstractArrow.stepMoveAndHit`: the nearest entity on the way, else the
-    /// block (piercing is not modelled).
+    /// block. A piercing arrow that hits an entity here goes on from it next
+    /// tick (`finish_entity_hit`); vanilla's loop goes on within the same tick.
    fn step_move_and_hit(&mut self, from: Vec3, to: Vec3, targets: &[(Who, Aabb)]) -> Hit {
        let block = self.scene.clip(from, to);
        let end = block.map_or(to, |b| b.0);
@@ -649,10 +710,16 @@ impl Ticker<'_, '_, '_, '_> {
            .expand_towards(self.p.velocity)
            .inflate(Vec3::new(1.0, 1.0, 1.0));
        let mut best: Option<(Who, Vec3, f64)> = None;
+        // ThrownTrident.findHitEntity: none once it has dealt damage.
+        let targets = if self.st.dealt_damage { &[] } else { targets };
        for (who, b) in targets {
            if Some(*who) == self.p.owner && !self.p.left_owner || !b.intersects(area) {
                continue;
            }
+            // canHitEntity: not an entity a piercing arrow has gone through.
+            if self.st.pierced.contains(who) {
+                continue;
+            }
            if let Some(at) = self.entity_hit(b, from, end, margin) {
                // Sorted by the distance to the entity's position (the
                // stable sort keeps the first of equals).
@@ -667,6 +734,15 @@ impl Ticker<'_, '_, '_, '_> {
        self.p.position = next;
        self.apply_effects_from_blocks(from, next);
        if let Some((who, at, _)) = best {
+            // AbstractArrow.onHitEntity: past pierce level + 1 entities the
+            // arrow is discarded before it hurts the next one.
+            if self.st.pierce > 0 {
+                if self.st.pierced.len() > usize::from(self.st.pierce) {
+                    self.st.removed = true;
+                    return Hit::None;
+                }
+                self.st.pierced.push(who);
+            }
            return Hit::Entity { who, at };
        }
        let Some((at, pos, face)) = block else {
@@ -706,12 +782,33 @@ impl Ticker<'_, '_, '_, '_> {
    /// `playSound(soundEvent, 1, 1.2 / (random * 0.2 + 0.9))`.
    fn hit_sound(&mut self) {
        let pitch = 1.2 / (self.st.random.next_float() * 0.2 + 0.9);
+        let sound = if self.trident() {
+            ArrowSound::TridentHitGround
+        } else {
+            ArrowSound::HitGround
+        };
        self.st.events.push(ArrowEvent::Sound {
-            sound: ArrowSound::HitGround,
+            sound,
            volume: 1.0,
            pitch,
        });
    }
+    /// `ThrownTrident.onHitEntity` after the hurt, whether it landed or not:
+    /// the hit sound, then `deflect(REVERSE, ..., (0.02, 0.2, 0.02))`. The
+    /// trident keeps flying (it has dealt its damage) and falls.
+    fn trident_bounce(&mut self) {
+        self.st.dealt_damage = true;
+        self.st.events.push(ArrowEvent::Sound {
+            sound: ArrowSound::TridentHit,
+            volume: 1.0,
+            pitch: 1.0,
+        });
+        // ProjectileDeflection.REVERSE.
+        let rotation = 170.0 + self.st.random.next_float() * 20.0;
+        let v = self.p.velocity;
+        self.p.velocity = Vec3::new(v.x * (-0.02 * 0.5), v.y * (-0.2 * 0.5), v.z * (-0.02 * 0.5));
+        self.p.yaw += rotation;
+    }
    /// `onHitEntity` when the entity took no damage: `deflect(REVERSE, 0.2)`,
    /// a half turn give or take ten degrees at a tenth of the speed; one
    /// left almost still drops its pickup (ALLOWED) and is discarded.
@@ -752,6 +849,7 @@ impl Ticker<'_, '_, '_, '_> {
        self.st.shake = 7;
        self.p.set_critical(false);
        self.st.pierce = 0;
+        self.st.pierced.clear();
    }
    /// `Projectile.mayInteract`: a mob's arrows need `mob_griefing`.
    fn may_interact(&self) -> bool {
@@ -234,3 +234,81 @@ impl RenderAssets {
        })
    }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::items::ConsumeEffect;
+
+    #[test]
+    fn always_edible_and_consume_effects_loaded() {
+        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client/26.3");
+        if !root.join("items.json").exists() {
+            return;
+        }
+        let assets = crate::assets::Assets::load(&root).unwrap();
+        let facts = crate::blocks::BlockFacts::load(&root, assets.registry).unwrap();
+        let items = crate::items::Items::load(&root, assets.registry, &facts).unwrap();
+
+        let apple = items.get("minecraft:golden_apple").expect("golden apple");
+        assert!(apple.can_always_eat);
+        assert!(apple.food.is_some());
+        assert!(!apple.consumable.as_ref().unwrap().effects.is_empty());
+
+        let enchanted = items
+            .get("minecraft:enchanted_golden_apple")
+            .expect("enchanted golden apple");
+        assert!(enchanted.can_always_eat);
+        assert!(enchanted.food.is_some());
+        assert!(!enchanted.consumable.as_ref().unwrap().effects.is_empty());
+
+        let beef = items.get("minecraft:cooked_beef").expect("cooked beef");
+        assert!(!beef.can_always_eat);
+        assert!(beef.food.is_some());
+
+        // Consumables without food, their style and their remainders.
+        use horizon_world::consumable::UseAnimation;
+        let milk = items.get("minecraft:milk_bucket").expect("milk bucket");
+        let drink = milk.consumable.as_ref().unwrap();
+        assert!(milk.food.is_none());
+        assert_eq!(drink.effects, [ConsumeEffect::ClearAllEffects]);
+        assert_eq!((drink.ticks(), drink.animation), (32, UseAnimation::Drink));
+        assert_eq!(drink.sound, "minecraft:entity.generic.drink");
+        assert!(!drink.particles);
+        assert_eq!(milk.use_remainder.as_deref(), Some("minecraft:bucket"));
+        let honey = items.get("minecraft:honey_bottle").expect("honey bottle");
+        let sip = honey.consumable.as_ref().unwrap();
+        assert_eq!(sip.ticks(), 40);
+        assert_eq!(sip.sound, "minecraft:item.honey_bottle.drink");
+        assert_eq!(
+            sip.effects,
+            [ConsumeEffect::RemoveEffects(vec![
+                "minecraft:poison".into()
+            ])]
+        );
+        assert_eq!(
+            honey.use_remainder.as_deref(),
+            Some("minecraft:glass_bottle")
+        );
+        let kelp = items.get("minecraft:dried_kelp").unwrap();
+        let bite = kelp.consumable.as_ref().unwrap();
+        assert_eq!((bite.ticks(), bite.animation), (16, UseAnimation::Eat));
+        assert_eq!(bite.sound, "minecraft:entity.generic.eat");
+        assert!(bite.particles && kelp.use_remainder.is_none());
+        let chorus = items.get("minecraft:chorus_fruit").unwrap();
+        assert_eq!(
+            chorus.consumable.as_ref().unwrap().effects,
+            [ConsumeEffect::TeleportRandomly(
+                horizon_world::teleport_consume::TeleportConsume {
+                    diameter: 16.0,
+                    directional_particles: true,
+                }
+            )]
+        );
+        let chicken = items.get("minecraft:chicken").unwrap();
+        assert!(matches!(
+            chicken.consumable.as_ref().unwrap().effects[..],
+            [ConsumeEffect::ApplyEffects { probability, .. }] if probability == 0.3
+        ));
+    }
+}
@@ -3,8 +3,8 @@
 //! `filter`, `unstitch` and `paletted_permutations` sources run in order
 //! against the resource tree; a later source replaces an earlier sprite of
 //! the same id and a filter removes the matching ones.
-use crate::packs::pattern::Pattern;
 use horizon_assets::palette::apply_palette;
+use horizon_client_core::pattern::Pattern;
 use serde_json::Value;
 use std::{
    collections::BTreeMap,
@@ -719,11 +719,6 @@ impl Audio {
        self.play(event, at, volume, pitch);
        self.capture = capture;
    }
-    /// `LivingEntity.handleDamageEvent`'s pitch, `(r - r) * 0.2 + 1`, drawn on the
-    /// client (the entity's own random there, never the server's world random).
-    pub fn hurt_pitch(&mut self) -> f32 {
-        (self.random.next_float() - self.random.next_float()) * 0.2 + 1.0
-    }
    /// `AbstractWidget.playButtonClickSound`: an unseeded, relative UI sound.
    pub fn play_button_click(&mut self) {
        self.play_instance(
@@ -179,7 +179,7 @@ fn agent() -> ureq::Agent {
 }

 /// The discovery document, fetched once per game (a failure is retried next time).
-fn discovery() -> Result<Arc<serde_json::Value>, JoinError> {
+pub(crate) fn discovery() -> Result<Arc<serde_json::Value>, JoinError> {
    static CACHE: Mutex<Option<Arc<serde_json::Value>>> = Mutex::new(None);
    if let Some(d) = CACHE.lock().unwrap().clone() {
        return Ok(d);
@@ -3,24 +3,10 @@
 //! banners, and the loom rules of `LoomMenu` (selectable patterns, the
 //! six-layer limit and the result stack).
 use crate::{block_entity_render::DYES, items::ItemStack, items::Items};
-use horizon_world::nbt::Tag;
 use serde_json::Value;
 use std::{collections::HashMap, fs, path::Path, sync::Arc};

-/// `BannerPatternLayers.Layer`: a pattern id and the dye name it is painted in.
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub struct BannerLayer {
-    pub pattern: Arc<str>,
-    pub color: Arc<str>,
-}
-impl BannerLayer {
-    pub fn new(pattern: &str, color: &str) -> Self {
-        Self {
-            pattern: Arc::from(pattern),
-            color: Arc::from(color),
-        }
-    }
-}
+pub use horizon_items::banner_layer::{BannerLayer, layers_from_nbt, layers_to_nbt};

 /// Layers a loom may stack on a banner (`LoomMenu`'s `hasMaxPatterns`).
 pub const MAX_LAYERS: usize = 6;
@@ -224,44 +210,6 @@ pub fn has_max_layers(banner: &ItemStack) -> bool {
    layers(banner).len() >= MAX_LAYERS
 }

-/// The `banner_patterns` NBT list of layers.
-pub fn layers_to_nbt(layers: &[BannerLayer]) -> Tag {
-    Tag::List(
-        layers
-            .iter()
-            .map(|l| {
-                Tag::compound([
-                    ("pattern", Tag::String((&*l.pattern).into())),
-                    ("color", Tag::String((&*l.color).into())),
-                ])
-            })
-            .collect(),
-    )
-}
-pub fn layers_from_nbt(tag: Option<&Tag>) -> Vec<BannerLayer> {
-    let Some(Tag::List(list)) = tag else {
-        return Vec::new();
-    };
-    list.iter()
-        .filter_map(|e| {
-            let text = |k: &str| match e.get(k) {
-                Some(Tag::String(s)) => Some(s.to_string_lossy()),
-                _ => None,
-            };
-            let pattern = text("pattern")?;
-            let color = text("color")?;
-            Some(BannerLayer::new(
-                &if pattern.contains(':') {
-                    pattern
-                } else {
-                    format!("minecraft:{pattern}")
-                },
-                &color,
-            ))
-        })
-        .collect()
-}
-
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -3,6 +3,7 @@
 //! the rain, nor through a blocked front, unless the hive is emptied in an
 //! emergency), honey for every bee coming home with nectar. The host (the game
 //! or the mob AI probe) loads and adds the bees through [`HiveHost`].
+pub use crate::chunk::block_entity::{Beehive, Occupant};
 use crate::mobs::{Mob, Species, bee};
 use horizon_core::random::{LegacyRandom, RandomSource};
 use horizon_world::nbt::{Compound, Tag};
@@ -38,20 +39,6 @@ const IGNORED_BEE_TAGS: [&str; 25] = [
    "UUID",
 ];

-/// `BeehiveBlockEntity`: the bees inside and the flower one of them knew.
-#[derive(Clone, Debug, Default, PartialEq)]
-pub struct Beehive {
-    pub bees: Vec<Occupant>,
-    pub flower: Option<[i32; 3]>,
-}
-/// `BeehiveBlockEntity.Occupant`: a bee's tag (with its `id`), its time in
-/// the hive and the time it stays at least.
-#[derive(Clone, Debug, PartialEq)]
-pub struct Occupant {
-    pub entity_data: Tag,
-    pub ticks_in_hive: i32,
-    pub min_ticks_in_hive: i32,
-}
 /// `BeehiveBlockEntity.BeeReleaseStatus`.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum Release {
@@ -450,6 +450,54 @@ mod tests {
        assert_eq!(view_chunks(32), 2573);
        assert_eq!(view_chunks(0), 0);
    }
+    /// The status a fake control answers with: the player is where it should
+    /// be, nothing is queued, and the world holds `chunks` resident chunks.
+    fn status(chunks: u64) -> String {
+        serde_json::json!({
+            "player": {"position": [0.0, 64.0, 0.0]},
+            "pending_chunks": 0,
+            "screen": "playing",
+            "render_distance": 12,
+            "chunks": chunks,
+            "generated_chunks": chunks,
+            "meshed_sections": 0,
+            "streaming": {},
+        })
+        .to_string()
+    }
+
+    #[test]
+    fn the_load_waits_for_the_chunks_a_teleport_starts() {
+        // Right after a teleport the game reports steady counts and nothing
+        // queued for over a second, before the integrated server has sent the
+        // first chunk: the quiet rule alone would call that loaded, and the
+        // scene would be measured over an empty view (#1749).
+        const LATE: usize = 30;
+        let (tx, rx) = mpsc::channel::<Request>();
+        let polls = std::sync::Arc::new(std::sync::atomic::AtomicUsize::new(0));
+        let counted = std::sync::Arc::clone(&polls);
+        let server = thread::spawn(move || {
+            let mut seen = 0;
+            while let Ok(request) = rx.recv() {
+                if request.line == "status" {
+                    let chunks = if seen < LATE { 0 } else { 400 };
+                    seen += 1;
+                    counted.store(seen, std::sync::atomic::Ordering::SeqCst);
+                    let _ = request.reply.send(status(chunks));
+                } else {
+                    let _ = request.reply.send("{}".to_owned());
+                }
+            }
+        });
+        let control = Control(tx);
+        wait_loaded(&control, |_| true).expect("the scene loads");
+        assert!(
+            polls.load(std::sync::atomic::Ordering::SeqCst) > LATE,
+            "the load finished before the chunks arrived"
+        );
+        drop(control);
+        let _ = server.join();
+    }

    #[test]
    fn yaw_matches_vanilla() {
@@ -0,0 +1,302 @@
+//! Right-to-left text (`FormattedBidiReorder.reorder`, behind
+//! `Language.getVisualOrder`): the logical text a player types becomes the
+//! glyphs a font draws left to right. Arabic letters are shaped into their
+//! joined presentation forms (ICU's `ArabicShaping` with `LETTERS_SHAPE`), the
+//! text is reordered by the Unicode bidirectional algorithm, and characters in
+//! right-to-left runs are mirrored. Left-to-right text comes back unchanged.
+use crate::text::{Span, Text};
+use std::borrow::Cow;
+use unicode_bidi::{
+    BidiClass, Direction, Level, ParagraphBidiInfo, bidi_class, get_base_direction,
+};
+
+/// How a letter joins its neighbours, as ICU's shaper sees it: `Right` joins
+/// the letter before it only, `Dual` both neighbours, `Mark` is skipped over
+/// (diacritics) and `None` never joins.
+#[derive(Clone, Copy, PartialEq)]
+enum Join {
+    None,
+    Right,
+    Dual,
+    Mark,
+}
+use Join::{Dual, Mark, Right};
+
+/// ICU's joining table (`araLink`): code point ranges and their class, with the
+/// lam-alef ligatures at the end. Anything else is `Join::None`.
+const JOINS: &[(u32, u32, Join)] = &[
+    (0x0622, 0x0625, Right),
+    (0x0626, 0x0626, Dual),
+    (0x0627, 0x0627, Right),
+    (0x0628, 0x0628, Dual),
+    (0x0629, 0x0629, Right),
+    (0x062A, 0x062E, Dual),
+    (0x062F, 0x0632, Right),
+    (0x0633, 0x063A, Dual),
+    (0x0640, 0x0647, Dual),
+    (0x0648, 0x0649, Right),
+    (0x064A, 0x064A, Dual),
+    (0x064B, 0x0656, Mark),
+    (0x0670, 0x0670, Mark),
+    (0x0671, 0x0673, Right),
+    (0x0675, 0x0677, Right),
+    (0x0678, 0x0687, Dual),
+    (0x0688, 0x0699, Right),
+    (0x069A, 0x06B9, Dual),
+    (0x06BA, 0x06BA, Right),
+    (0x06BB, 0x06BF, Dual),
+    (0x06C0, 0x06C0, Right),
+    (0x06C1, 0x06C1, Dual),
+    (0x06C2, 0x06CB, Right),
+    (0x06CC, 0x06CC, Dual),
+    (0x06CD, 0x06CD, Right),
+    (0x06CE, 0x06D1, Dual),
+    (0x06D2, 0x06D3, Right),
+    (0x200D, 0x200D, Dual),
+    (0x206D, 0x206F, Mark),
+    (0xFEF5, 0xFEFC, Right),
+];
+
+/// Letters that have joined forms and the code point of the isolated one; the
+/// final, initial and medial forms follow it (a right-joining letter has the
+/// isolated and final only). The lam-alef ligatures are their own letters.
+/// ICU leaves the extended letters (پ چ ژ ک گ ی and the rest of U+0679 to
+/// U+06D3) unchanged, so they are in `JOINS` but not here.
+#[rustfmt::skip]
+const FORMS: &[(u32, u32)] = &[
+    (0x0622, 0xFE81), (0x0623, 0xFE83), (0x0624, 0xFE85), (0x0625, 0xFE87), (0x0626, 0xFE89),
+    (0x0627, 0xFE8D), (0x0628, 0xFE8F), (0x0629, 0xFE93), (0x062A, 0xFE95), (0x062B, 0xFE99),
+    (0x062C, 0xFE9D), (0x062D, 0xFEA1), (0x062E, 0xFEA5), (0x062F, 0xFEA9), (0x0630, 0xFEAB),
+    (0x0631, 0xFEAD), (0x0632, 0xFEAF), (0x0633, 0xFEB1), (0x0634, 0xFEB5), (0x0635, 0xFEB9),
+    (0x0636, 0xFEBD), (0x0637, 0xFEC1), (0x0638, 0xFEC5), (0x0639, 0xFEC9), (0x063A, 0xFECD),
+    (0x0641, 0xFED1), (0x0642, 0xFED5), (0x0643, 0xFED9), (0x0644, 0xFEDD), (0x0645, 0xFEE1),
+    (0x0646, 0xFEE5), (0x0647, 0xFEE9), (0x0648, 0xFEED), (0x0649, 0xFEEF), (0x064A, 0xFEF1),
+    (0xFEF5, 0xFEF5), (0xFEF7, 0xFEF7), (0xFEF9, 0xFEF9), (0xFEFB, 0xFEFB),
+];
+
+/// `Bidi_Mirroring_Glyph` (`UCharacter.getMirror`): each pair is two
+/// neighbouring characters that mirror each other.
+const MIRRORED: &str = "\
+        ()<>[]{}«»༺༻༼༽᚛᚜‹›⁅⁆⁽⁾₍₎∈∋∉∌∊∍∕⧵∟⯾∠⦣∡⦛∢⦠∤⫮∼∽≃⋍≅≌≒≓\
+        ≔≕≤≥≦≧≨≩≪≫≮≯≰≱≲≳≴≵≶≷≸≹≺≻≼≽≾≿⊀⊁⊂⊃⊄⊅⊆⊇⊈⊉⊊⊋⊏⊐⊑⊒⊘⦸⊢⊣⊦⫞\
+        ⊨⫤⊩⫣⊫⫥⊰⊱⊲⊳⊴⊵⊶⊷⊸⟜⋉⋊⋋⋌⋐⋑⋖⋗⋘⋙⋚⋛⋜⋝⋞⋟⋠⋡⋢⋣⋤⋥⋦⋧⋨⋩⋪⋫⋬⋭⋰⋱⋲⋺\
+        ⋳⋻⋴⋼⋶⋽⋷⋾⌈⌉⌊⌋〈〉❨❩❪❫❬❭❮❯❰❱❲❳❴❵⟃⟄⟅⟆⟈⟉⟋⟍⟕⟖⟝⟞⟢⟣⟤⟥⟦⟧⟨⟩⟪⟫\
+        ⟬⟭⟮⟯⦃⦄⦅⦆⦇⦈⦉⦊⦋⦌⦍⦐⦎⦏⦑⦒⦓⦔⦕⦖⦗⦘⦤⦥⦨⦩⦪⦫⦬⦭⦮⦯⧀⧁⧄⧅⧏⧐⧑⧒⧔⧕⧘⧙⧚⧛\
+        ⧨⧩⧸⧹⧼⧽⨫⨬⨭⨮⨴⨵⨼⨽⩤⩥⩹⩺⩻⩼⩽⩾⩿⪀⪁⪂⪃⪄⪅⪆⪇⪈⪉⪊⪋⪌⪍⪎⪏⪐⪑⪒⪓⪔⪕⪖⪗⪘⪙⪚\
+        ⪛⪜⪝⪞⪟⪠⪡⪢⪦⪧⪨⪩⪪⪫⪬⪭⪯⪰⪱⪲⪳⪴⪵⪶⪷⪸⪹⪺⪻⪼⪽⪾⪿⫀⫁⫂⫃⫄⫅⫆⫇⫈⫉⫊⫋⫌⫍⫎⫏⫐\
+        ⫑⫒⫓⫔⫕⫖⫬⫭⫷⫸⫹⫺⸂⸃⸄⸅⸉⸊⸌⸍⸜⸝⸠⸡⸢⸣⸤⸥⸦⸧⸨⸩⹕⹖⹗⹘⹙⹚⹛⹜〈〉《》「」『』【】\
+        〔〕〖〗〘〙〚〛﹙﹚﹛﹜﹝﹞﹤﹥（）＜＞［］｛｝｟｠｢｣";
+
+fn join(c: char) -> Join {
+    let c = c as u32;
+    JOINS
+        .iter()
+        .find(|&&(from, to, _)| (from..=to).contains(&c))
+        .map_or(Join::None, |&(_, _, join)| join)
+}
+
+/// The letter whose joined form `c` is (ICU shapes the forms again), or `c`.
+fn letter_of(c: char) -> char {
+    let c32 = c as u32;
+    if !matches!(c32, 0xFE70..=0xFEFC) {
+        return c;
+    }
+    if (0xFE70..0xFE80).contains(&c32) {
+        // The diacritics' forms pair up from fathatan on.
+        return char::from_u32(0x064B + (c32 - 0xFE70) / 2).unwrap_or(c);
+    }
+    FORMS
+        .iter()
+        .find(|&&(letter, iso)| {
+            let forms = if join(char::from_u32(letter).unwrap_or(c)) == Dual {
+                4
+            } else {
+                2
+            };
+            (iso..iso + forms).contains(&c32)
+        })
+        .and_then(|&(letter, _)| char::from_u32(letter))
+        .unwrap_or(c)
+}
+
+/// `ArabicShaping(LETTERS_SHAPE).shape`: lam followed by an alef (diacritics
+/// may sit between) becomes one ligature, then every letter takes the isolated,
+/// final, initial or medial form its neighbours call for. Diacritics take the
+/// tatweel form between two joined letters. The text can only get shorter.
+fn shape(text: &[char]) -> Vec<char> {
+    let letters: Vec<char> = text.iter().map(|&c| letter_of(c)).collect();
+    let mut chars = Vec::with_capacity(letters.len());
+    let mut i = 0;
+    while i < letters.len() {
+        if letters[i] == '\u{644}' {
+            let mut at = i + 1;
+            while letters.get(at).is_some_and(|&c| join(c) == Mark) {
+                at += 1;
+            }
+            let alef = letters.get(at).and_then(|&c| {
+                ['\u{622}', '\u{623}', '\u{625}', '\u{627}']
+                    .iter()
+                    .position(|&a| a == c)
+            });
+            if let Some(alef) = alef {
+                chars.push(char::from_u32(0xFEF5 + 2 * alef as u32).unwrap_or('\u{644}'));
+                chars.extend_from_slice(&letters[i + 1..at]);
+                i = at + 1;
+                continue;
+            }
+        }
+        chars.push(letters[i]);
+        i += 1;
+    }
+    // Whether the nearest letter before joins the next one, and the joins of
+    // the nearest letter after.
+    let mut joins_next = false;
+    let mut out = Vec::with_capacity(chars.len());
+    for (i, &c) in chars.iter().enumerate() {
+        let next_joins = chars[i + 1..]
+            .iter()
+            .map(|&n| join(n))
+            .find(|&j| j != Mark)
+            .is_some_and(|j| j != Join::None);
+        let kind = join(c);
+        let shaped = match kind {
+            Join::None => {
+                joins_next = false;
+                c
+            }
+            Mark => match c as u32 {
+                m @ 0x064B..=0x0652 => {
+                    let iso = 0xFE70 + 2 * (m - 0x064B);
+                    let tatweel = joins_next && next_joins && !matches!(m, 0x064C | 0x064D);
+                    char::from_u32(iso + u32::from(tatweel)).unwrap_or(c)
+                }
+                _ => c,
+            },
+            Right | Dual => {
+                let to_next = kind == Dual && next_joins;
+                let form = match (joins_next, to_next) {
+                    (false, false) => 0,
+                    (true, false) => 1,
+                    (false, true) => 2,
+                    (true, true) => 3,
+                };
+                joins_next = kind == Dual;
+                FORMS
+                    .binary_search_by_key(&(c as u32), |&(letter, _)| letter)
+                    .ok()
+                    .and_then(|at| char::from_u32(FORMS[at].1 + form))
+                    .unwrap_or(c)
+            }
+        };
+        out.push(shaped);
+    }
+    out
+}
+
+/// `UCharacter.getMirror`.
+fn mirror(c: char) -> char {
+    if bidi_class(c) != BidiClass::ON {
+        return c;
+    }
+    let mut pairs = MIRRORED.chars();
+    while let (Some(a), Some(b)) = (pairs.next(), pairs.next()) {
+        if c == a {
+            return b;
+        }
+        if c == b {
+            return a;
+        }
+    }
+    c
+}
+
+/// Whether a character can change anything: right-to-left letters and numbers,
+/// the explicit direction controls and the diacritics that shaping turns into
+/// letters. Without any, left-to-right text keeps its order.
+fn directional(c: char) -> bool {
+    c as u32 >= 0x0590
+        && (matches!(c as u32, 0x064B..=0x0652)
+            || matches!(
+                bidi_class(c),
+                BidiClass::R
+                    | BidiClass::AL
+                    | BidiClass::AN
+                    | BidiClass::LRE
+                    | BidiClass::RLE
+                    | BidiClass::LRO
+                    | BidiClass::RLO
+                    | BidiClass::PDF
+                    | BidiClass::LRI
+                    | BidiClass::RLI
+                    | BidiClass::FSI
+                    | BidiClass::PDI
+            ))
+}
+
+/// Whether `chars` keep their order and shapes: left-to-right text without
+/// anything directional, in a language that reads left to right by default.
+fn unchanged(mut chars: impl Iterator<Item = char>, default_rtl: bool) -> bool {
+    !default_rtl && !chars.any(directional)
+}
+
+/// `FormattedBidiReorder.reorder`: `chars` shaped, in visual order, with each
+/// character's position in the shaped text. A character's style is the one at
+/// its position in the shaped text, as `SubStringSource` takes it (the text
+/// shrinks at a lam-alef ligature).
+fn reorder(chars: &[char], default_rtl: bool) -> Vec<(char, usize)> {
+    let shaped = shape(chars);
+    let plain: String = shaped.iter().collect();
+    // DEFAULT_RTL only changes text without a strong character.
+    let level =
+        (default_rtl && get_base_direction(plain.as_str()) == Direction::Mixed).then(Level::rtl);
+    let info = ParagraphBidiInfo::new(&plain, level);
+    let levels = info.reordered_levels_per_char(0..plain.len());
+    ParagraphBidiInfo::reorder_visual(&levels)
+        .into_iter()
+        .map(|i| {
+            let c = if levels[i].is_rtl() {
+                mirror(shaped[i])
+            } else {
+                shaped[i]
+            };
+            (c, i)
+        })
+        .collect()
+}
+
+/// `Language.getVisualOrder` of a text (its `§` codes already resolved), for
+/// the current language's direction.
+pub fn visual(text: &Text) -> Cow<'_, Text> {
+    let default_rtl = crate::lang::bidirectional();
+    if unchanged(text.chars().map(|(c, _)| c), default_rtl) {
+        return Cow::Borrowed(text);
+    }
+    let chars: Vec<char> = text.chars().map(|(c, _)| c).collect();
+    let styles: Vec<_> = text.chars().map(|(_, style)| style).collect();
+    let mut out = Text::default();
+    for (c, at) in reorder(&chars, default_rtl) {
+        match out.spans.last_mut() {
+            Some(span) if span.style == *styles[at] => span.text.push(c),
+            _ => out.spans.push(Span {
+                text: c.to_string(),
+                style: styles[at].clone(),
+            }),
+        }
+    }
+    Cow::Owned(out)
+}
+
+/// The same for a plain string.
+pub fn visual_str(s: &str) -> Cow<'_, str> {
+    let default_rtl = crate::lang::bidirectional();
+    if unchanged(s.chars(), default_rtl) {
+        return Cow::Borrowed(s);
+    }
+    let chars: Vec<char> = s.chars().collect();
+    Cow::Owned(
+        reorder(&chars, default_rtl)
+            .into_iter()
+            .map(|(c, _)| c)
+            .collect(),
+    )
+}
@@ -1,7 +1,7 @@
 //! Biome colours from the pinned biome definitions and colormaps
 //! (`Biome.getGrassColor`/`getFoliageColor`/..., `BlockTintSources`).
 use crate::Result;
-use horizon_core::{noise::SimplexNoise, random::LegacyRandom};
+use horizon_core::{noise::SimplexNoise, position::BlockPos, random::LegacyRandom};
 use serde_json::Value;
 use std::{collections::HashMap, fs, path::Path};

@@ -28,8 +28,13 @@ pub struct BiomeInfo {
    pub spawn_costs: HashMap<String, crate::mobs::spawn_selection::SpawnCost>,
    /// The `gameplay/creature_world_gen_spawn_probability` attribute.
    pub creature_probability: f32,
+    /// The `gameplay/increased_fire_burnout` attribute (jungles, swamps, peaks,
+    /// mushroom fields).
+    pub increased_fire_burnout: bool,
    pub name: String,
    pub temperature: f32,
+    /// `temperature_modifier: frozen` (the frozen oceans).
+    pub frozen: bool,
    pub downfall: f32,
    pub precipitation: bool,
    pub grass: u32,
@@ -42,6 +47,33 @@ pub struct BiomeInfo {
    pub fog: Option<u32>,
    pub water_fog: u32,
 }
+impl BiomeInfo {
+    /// `Biome.getHeightAdjustedTemperature`: the frozen modifier, then cooler
+    /// with height above `sea_level + 17`.
+    pub fn temperature_at(&self, pos: BlockPos, sea_level: i32) -> f32 {
+        use horizon_world::worldgen::biome_temperature::{
+            BiomeTemperatureSettings, TemperatureModifier,
+        };
+        BiomeTemperatureSettings {
+            base_temperature: self.temperature,
+            modifier: if self.frozen {
+                TemperatureModifier::Frozen
+            } else {
+                TemperatureModifier::None
+            },
+            has_precipitation: self.precipitation,
+            downfall: self.downfall,
+        }
+        .height_adjusted(pos, sea_level)
+    }
+    /// `Biome.getPrecipitationAt` in the Overworld (sea level 63): None
+    /// without precipitation, else whether it falls as snow
+    /// (`getHeightAdjustedTemperature` below 0.15).
+    pub fn snows_at(&self, x: i32, y: i32, z: i32) -> Option<bool> {
+        self.precipitation
+            .then(|| self.temperature_at(BlockPos::new(x, y, z), 63) < 0.15)
+    }
+}
 pub struct Biomes {
    pub list: Vec<BiomeInfo>,
    pub index: HashMap<String, u16>,
@@ -128,7 +160,11 @@ impl Biomes {
                    attributes["minecraft:gameplay/creature_world_gen_spawn_probability"]
                        .as_f64()
                        .unwrap_or(0.1) as f32,
+                increased_fire_burnout: attributes["minecraft:gameplay/increased_fire_burnout"]
+                    .as_bool()
+                    .unwrap_or(false),
                temperature,
+                frozen: v["temperature_modifier"].as_str() == Some("frozen"),
                downfall,
                precipitation: v["has_precipitation"].as_bool().unwrap_or(true),
                grass: color(&effects["grass_color"])
@@ -23,7 +23,7 @@
 //! Which states tick is a table by state id, built by the game from the block
 //! registry; whether a slot is made is decided when the slot is promoted at
 //! the start of the next tick, from the block state then.
-use crate::containers::BlockEntity;
+use crate::chunk::block_entity::BlockEntity;
 use crate::fast_hash::{FxHashMap, FxHashSet};
 use std::collections::HashMap;

@@ -648,6 +648,61 @@ impl Conduit {
    }
 }

+/// What `ConduitBlockEntity.serverTick`'s 40-tick check decided.
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct ConduitCheck {
+    /// The shape changed: `CONDUIT_ACTIVATE` (true) or `CONDUIT_DEACTIVATE`.
+    pub toggled: Option<bool>,
+    /// The frame blocks counted, while the conduit is active: `applyEffects`
+    /// and `updateAndAttackTarget` follow (the attack needs 42 or more).
+    pub frames: Option<usize>,
+}
+
+/// `ConduitBlockEntity` (server side): what `serverTick` keeps between ticks.
+#[derive(Clone, Debug, Default)]
+pub struct ConduitServer {
+    shape: Conduit,
+    /// `destroyTarget`: the mob id of the enemy being struck.
+    pub target: Option<u32>,
+    next_ambient_sound: i64,
+}
+
+impl ConduitServer {
+    /// The `gameTime % 40` part of `serverTick`: the shape is checked again.
+    pub fn check(
+        &mut self,
+        pos: [i32; 3],
+        game_time: i64,
+        is_water: impl Fn([i32; 3]) -> bool,
+        is_frame: impl Fn([i32; 3]) -> bool,
+    ) -> Option<ConduitCheck> {
+        if game_time % 40 != 0 {
+            return None;
+        }
+        let active = self.shape.update_shape(pos, &is_water, &is_frame);
+        let toggled = (active != self.shape.is_active).then_some(active);
+        self.shape.is_active = active;
+        Some(ConduitCheck {
+            toggled,
+            frames: active.then_some(self.shape.effect_blocks.len()),
+        })
+    }
+    /// The sounds of an active conduit at the end of `serverTick`: whether
+    /// `CONDUIT_AMBIENT` (every 80 ticks) and `CONDUIT_AMBIENT_SHORT` (every
+    /// 60 to 99 ticks) play.
+    pub fn ambient(&mut self, game_time: i64, random: &mut impl RandomSource) -> (bool, bool) {
+        if !self.shape.is_active {
+            return (false, false);
+        }
+        let short = game_time > self.next_ambient_sound;
+        if short {
+            self.next_ambient_sound =
+                game_time + 60 + i64::from(random.next_int_bound(40).unwrap_or(0));
+        }
+        (game_time % 80 == 0, short)
+    }
+}
+
 /// `SkullBlockEntity` animation (client ticker of dragon and piglin heads).
 #[derive(Clone, Copy, Debug, Default, PartialEq)]
 pub struct Skull {
@@ -832,6 +887,8 @@ pub struct BlockEntityAnims {
    pub gateways: FxHashMap<[i32; 3], EndGateway>,
    /// The integrated server's copies of the gateways (`portalTick`).
    pub gateway_servers: FxHashMap<[i32; 3], EndGateway>,
+    /// The integrated server's copies of the conduits (`serverTick`).
+    pub conduit_servers: FxHashMap<[i32; 3], ConduitServer>,
    /// The client level's random (conduit particles).
    pub random: LegacyRandom,
    /// [`Ticker`] by block state id (see [`BlockEntityAnims::classify`]).
@@ -854,6 +911,7 @@ impl Default for BlockEntityAnims {
            pots: FxHashMap::default(),
            gateways: FxHashMap::default(),
            gateway_servers: FxHashMap::default(),
+            conduit_servers: FxHashMap::default(),
            random: LegacyRandom::new(0x6c6576656c),
            kinds: Vec::new(),
            present: Vec::new(),
@@ -909,6 +967,7 @@ impl BlockEntityAnims {
        self.pots.retain(|p, _| keep(*p));
        self.gateways.retain(|p, _| keep(*p));
        self.gateway_servers.retain(|p, _| keep(*p));
+        self.conduit_servers.retain(|p, _| keep(*p));
    }
    /// `getOpenNess(partial)` of the chest or ender chest at `pos`.
    pub fn lid(&self, pos: [i32; 3], partial: f32) -> f32 {
@@ -5,7 +5,11 @@
 //! (`entity-models.json`); transforms, animation and textures follow each
 //! vanilla renderer. Faces are lit like the `entity` shader: the lightmap at
 //! the block plus `minecraft_mix_light` with the level's two diffuse lights.
-use crate::{hud::Rect, mesher::Vertex, world::World};
+use crate::{
+    hud::Rect,
+    mesher::{CULL_BACK, Vertex},
+    world::World,
+};
 use glam::{DVec3, Mat4, Quat, Vec3};
 use horizon_core::geometry::{
    Direction,
@@ -149,6 +153,8 @@ pub fn draw_part(
                layer: 0,
                color,
                light,
+
+                glint_uv: [0.0, 0.0],
            });
        }
    }
@@ -610,7 +616,9 @@ fn sign_text_calls(
        .iter()
        .enumerate()
        .map(|(i, line)| {
+            // The line that fits, in the order it is drawn (getVisualOrder).
            let shown = first_line(line, data.max_line_width(), &advance);
+            let shown = crate::bidi::visual_str(&shown).into_owned();
            TextCall {
                matrix: m,
                x: -((width(&shown) as i32) / 2) as f32,
@@ -648,6 +656,8 @@ fn draw_text(scene: &Scene, call: &TextCall, out: &mut Vec<Vertex>) {
                        layer: 0,
                        color: c,
                        light: call.light,
+
+                        glint_uv: [0.0, 0.0],
                    });
                }
            }
@@ -734,7 +744,7 @@ pub struct Scene<'a> {
    /// The skin sprite a `player_head` shows at a position (`SkullBlockRenderer`
    /// profile → skin): a downloaded `skins/<sha1>` slot or the profile's
    /// `DefaultPlayerSkin` fallback; None keeps `SKIN_BY_TYPE` (`DefaultPlayerSkin.getDefaultTexture`, slim steve).
-    pub skull: &'a dyn Fn([i32; 3]) -> Option<&'a str>,
+    pub skull: &'a dyn Fn([i32; 3]) -> Option<String>,
    /// Font glyph cell (none for blank glyphs such as the space) and advance.
    pub glyph: &'a dyn Fn(char) -> (Option<Rect>, f32),
 }
@@ -932,6 +942,30 @@ impl BlockEntityRenderer {
        let lights = diffuse_lights(scene.nether);
        self.render_one(scene, pos, kind, base, packed, lights, false, false, out);
    }
+    /// `TheEndGatewayBlockEntity.shouldRenderFace` for each face of the gateway
+    /// at `pos`: the faces its portal is drawn on.
+    pub fn gateway_faces(
+        &self,
+        world: &World,
+        state: BlockStateId,
+        pos: [i32; 3],
+    ) -> Vec<Direction> {
+        Direction::ALL
+            .into_iter()
+            .filter(|&d| {
+                let [dx, dy, dz] = d.normal();
+                let neighbor = world.block(pos[0] + dx, pos[1] + dy, pos[2] + dz);
+                self.visibility.as_ref().is_none_or(|v| {
+                    v.lock()
+                        .map(|mut v| {
+                            v.should_render_face(state, neighbor, d, true)
+                                .unwrap_or(true)
+                        })
+                        .unwrap_or(true)
+                })
+            })
+            .collect()
+    }
    /// Whether this block state has a block-entity renderer here.
    pub fn renders(&self, state: u32) -> bool {
        !matches!(self.kind(state), Kind::None)
@@ -1286,11 +1320,12 @@ impl BlockEntityRenderer {
                };
                // SkullBlockRenderer.getRenderType: the profile's skin when it
                // resolves, `SKIN_BY_TYPE` (steve) otherwise.
-                let texture = if *kind == SkullType::Player {
-                    (scene.skull)(pos).unwrap_or(texture)
+                let skin = if *kind == SkullType::Player {
+                    (scene.skull)(pos)
                } else {
-                    texture
+                    None
                };
+                let texture = skin.as_deref().unwrap_or(texture);
                let (Some(model), Some(paint)) =
                    (self.models.get(model), paint(texture, 0xFFFFFF, packed))
                else {
@@ -1385,6 +1420,7 @@ impl BlockEntityRenderer {
                        m *= around(Mat4::from_rotation_y(turn * decay), pivot);
                    }
                }
+                let first = out.len();
                if let Some(paint) =
                    paint("entity/decorated_pot/decorated_pot_base", 0xFFFFFF, packed)
                {
@@ -1402,6 +1438,11 @@ impl BlockEntityRenderer {
                        draw_part(part, side, m, &none, paint, out);
                    }
                }
+                // `DecoratedPotRenderer` submits every part with `entitySolid`, which culls
+                // back faces: the flat `top` and `bottom` planes show one side each.
+                for vertex in &mut out[first..] {
+                    vertex.normal = CULL_BACK;
+                }
            }
            Kind::EndPortal => {
                // TheEndPortalRenderer.TRANSFORMATION: y from 6/16 to 12/16; only the
@@ -1432,22 +1473,8 @@ impl BlockEntityRenderer {
                        out,
                    );
                }
-                // AbstractEndPortalRenderer.extractRenderState: TheEndGatewayBlockEntity.shouldRenderFace.
-                let faces: Vec<Direction> = Direction::ALL
-                    .into_iter()
-                    .filter(|&d| {
-                        let [dx, dy, dz] = d.normal();
-                        let neighbor = scene.world.block(pos[0] + dx, pos[1] + dy, pos[2] + dz);
-                        self.visibility.as_ref().is_none_or(|v| {
-                            v.lock()
-                                .map(|mut v| {
-                                    v.should_render_face(BlockStateId(*state), neighbor, d, true)
-                                        .unwrap_or(true)
-                                })
-                                .unwrap_or(true)
-                        })
-                    })
-                    .collect();
+                // AbstractEndPortalRenderer.extractRenderState.
+                let faces = self.gateway_faces(scene.world, BlockStateId(*state), pos);
                portal_cube(base, &faces, END_GATEWAY_LAYER, out);
            }
            Kind::Conduit => {
@@ -1714,6 +1741,8 @@ impl BeamPart {
                    layer: 6,
                    color,
                    light: self.wrap,
+
+                    glint_uv: [0.0, 0.0],
                });
            }
        }
@@ -1784,6 +1813,7 @@ fn portal_cube(m: Mat4, faces: &[Direction], layer: u32, out: &mut Vec<Vertex>)
                layer,
                color: 0,
                light: 0,
+                glint_uv: [0.0, 0.0],
            });
        }
    }
@@ -2108,4 +2138,70 @@ mod tests {
        assert_eq!(first_line("\u{6771}", 3.0, &advance), "\u{6771}");
        assert_eq!(first_line("ab\ncd", 100.0, &advance), "ab");
    }
+    /// `DecoratedPotRenderer` submits every part with `RenderTypes.entitySolid`,
+    /// whose pipeline culls back faces. The pot's `top` and `bottom` are flat
+    /// boxes, so without that cull both sides of each plane are drawn and they
+    /// z-fight: the pot renders wrong.
+    #[test]
+    fn the_decorated_pot_culls_its_back_faces() {
+        let root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client")
+            .join(horizon_core::VANILLA_VERSION);
+        if !root.join("entity-models.json").exists() {
+            return;
+        }
+        let assets = crate::assets::Assets::load(&root).unwrap();
+        let registry = assets.registry;
+        let renderer = BlockEntityRenderer::load(&root, registry).unwrap();
+        let state = registry.default_state("minecraft:decorated_pot").unwrap();
+        let sprites: HashMap<String, Rect> = [
+            "entity/decorated_pot/decorated_pot_base",
+            "entity/decorated_pot/decorated_pot_side",
+        ]
+        .into_iter()
+        .map(|name| {
+            (
+                name.to_owned(),
+                Rect {
+                    u0: 0.25,
+                    v0: 0.125,
+                    u1: 0.375,
+                    v1: 0.25,
+                    w: 16,
+                    h: 16,
+                },
+            )
+        })
+        .collect();
+        let world = World::new(BlockStateId(0), 1);
+        let scene = Scene {
+            camera: DVec3::ZERO,
+            orientation: Quat::IDENTITY,
+            anim: &|_| BlockAnim::default(),
+            texts: None,
+            partial: 0.5,
+            game_time: 0,
+            max_y: 320,
+            world: &world,
+            sprites: &sprites,
+            nether: false,
+            lid: &|_| 0.0,
+            sign: &|_| None,
+            banner: &|_| Vec::new(),
+            skull: &|_| None,
+            glyph: &|_| (None, 0.0),
+        };
+        let mut verts = Vec::new();
+        renderer.render_block(&scene, [0; 3], state.0, Mat4::IDENTITY, 0xff, &mut verts);
+        // Vanilla submits 28 quads for a plain pot, and the cull keeps them all.
+        assert_eq!(
+            verts.len() / 4,
+            28,
+            "the pot submits all of vanilla's quads"
+        );
+        assert!(
+            verts.iter().all(|v| v.normal == CULL_BACK),
+            "entitySolid culls the pot's back faces"
+        );
+    }
 }
@@ -49,6 +49,8 @@ pub fn geometry(
                    color: 0xffff_ffff,
                    light: stage_light(stage),
                    normal: [0; 4],
+
+                    glint_uv: [0.0, 0.0],
                });
            }
        }
@@ -2,239 +2,18 @@
 //! in vanilla, ported as tables), data-driven `minecraft:brewing` recipes from
 //! `data/minecraft/recipe/brewing`, potion colours and tooltips, and
 //! `BrewingStandBlockEntity.serverTick`.
+pub use crate::chunk::block_entity::BrewingStand;
 use crate::{
    containers::Providers,
    items::{ItemStack, Items},
 };
 use serde_json::Value;
-use std::{collections::HashSet, fs, path::Path, sync::Arc};
+use std::{collections::HashSet, fs, path::Path};

-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum Category {
-    Beneficial,
-    Harmful,
-    Neutral,
-}
-/// A `MobEffect`: id (without namespace), colour, category, instantaneous.
-#[derive(Clone, Copy, Debug)]
-pub struct EffectDef {
-    pub id: &'static str,
-    pub color: u32,
-    pub category: Category,
-    pub instant: bool,
-}
-const fn fx(id: &'static str, color: u32, category: Category) -> EffectDef {
-    EffectDef {
-        id,
-        color,
-        category,
-        instant: false,
-    }
-}
-use Category::{Beneficial as B, Harmful as H, Neutral as N};
-/// `MobEffects` in registration order.
-pub const EFFECTS: &[EffectDef] = &[
-    fx("speed", 3402751, B),
-    fx("slowness", 9154528, H),
-    fx("haste", 14270531, B),
-    fx("mining_fatigue", 4866583, H),
-    fx("strength", 16762624, B),
-    EffectDef {
-        id: "instant_health",
-        color: 16262179,
-        category: B,
-        instant: true,
-    },
-    EffectDef {
-        id: "instant_damage",
-        color: 11101546,
-        category: H,
-        instant: true,
-    },
-    fx("jump_boost", 16646020, B),
-    fx("nausea", 5578058, H),
-    fx("regeneration", 13458603, B),
-    fx("resistance", 9520880, B),
-    fx("fire_resistance", 16750848, B),
-    fx("water_breathing", 10017472, B),
-    fx("invisibility", 16185078, B),
-    fx("blindness", 2039587, H),
-    fx("night_vision", 12779366, B),
-    fx("hunger", 5797459, H),
-    fx("weakness", 4738376, H),
-    fx("poison", 8889187, H),
-    fx("wither", 7561558, H),
-    fx("health_boost", 16284963, B),
-    fx("absorption", 2445989, B),
-    EffectDef {
-        id: "saturation",
-        color: 16262179,
-        category: B,
-        instant: true,
-    },
-    fx("glowing", 9740385, N),
-    fx("levitation", 13565951, H),
-    fx("luck", 5882118, B),
-    fx("unluck", 12624973, H),
-    fx("slow_falling", 15978425, B),
-    fx("conduit_power", 1950417, B),
-    fx("dolphins_grace", 8954814, B),
-    fx("bad_omen", 745784, N),
-    fx("hero_of_the_village", 4521796, B),
-    fx("darkness", 2696993, H),
-    fx("trial_omen", 1484454, N),
-    fx("raid_omen", 14565464, N),
-    fx("wind_charged", 12438015, H),
-    fx("weaving", 7891290, H),
-    fx("oozing", 10092451, H),
-    fx("infested", 9214860, H),
-    fx("breath_of_the_nautilus", 65518, B),
-];
-pub fn effect(id: &str) -> Option<&'static EffectDef> {
-    let id = id.trim_start_matches("minecraft:");
-    EFFECTS.iter().find(|e| e.id == id)
-}
-/// A `Potion`: id, name suffix (`item.minecraft.potion.effect.<name>`) and
-/// effects as (effect, duration ticks, amplifier).
-#[derive(Clone, Copy, Debug)]
-pub struct PotionDef {
-    pub id: &'static str,
-    pub name: &'static str,
-    pub effects: &'static [(&'static str, i32, i32)],
-}
-const fn p(
-    id: &'static str,
-    name: &'static str,
-    effects: &'static [(&'static str, i32, i32)],
-) -> PotionDef {
-    PotionDef { id, name, effects }
-}
-/// `Potions` in registration order.
-pub const POTIONS: &[PotionDef] = &[
-    p("water", "water", &[]),
-    p("mundane", "mundane", &[]),
-    p("thick", "thick", &[]),
-    p("awkward", "awkward", &[]),
-    p("night_vision", "night_vision", &[("night_vision", 3600, 0)]),
-    p(
-        "long_night_vision",
-        "night_vision",
-        &[("night_vision", 9600, 0)],
-    ),
-    p("invisibility", "invisibility", &[("invisibility", 3600, 0)]),
-    p(
-        "long_invisibility",
-        "invisibility",
-        &[("invisibility", 9600, 0)],
-    ),
-    p("leaping", "leaping", &[("jump_boost", 3600, 0)]),
-    p("long_leaping", "leaping", &[("jump_boost", 9600, 0)]),
-    p("strong_leaping", "leaping", &[("jump_boost", 1800, 1)]),
-    p(
-        "fire_resistance",
-        "fire_resistance",
-        &[("fire_resistance", 3600, 0)],
-    ),
-    p(
-        "long_fire_resistance",
-        "fire_resistance",
-        &[("fire_resistance", 9600, 0)],
-    ),
-    p("swiftness", "swiftness", &[("speed", 3600, 0)]),
-    p("long_swiftness", "swiftness", &[("speed", 9600, 0)]),
-    p("strong_swiftness", "swiftness", &[("speed", 1800, 1)]),
-    p("slowness", "slowness", &[("slowness", 1800, 0)]),
-    p("long_slowness", "slowness", &[("slowness", 4800, 0)]),
-    p("strong_slowness", "slowness", &[("slowness", 400, 3)]),
-    p(
-        "turtle_master",
-        "turtle_master",
-        &[("slowness", 400, 3), ("resistance", 400, 2)],
-    ),
-    p(
-        "long_turtle_master",
-        "turtle_master",
-        &[("slowness", 800, 3), ("resistance", 800, 2)],
-    ),
-    p(
-        "strong_turtle_master",
-        "turtle_master",
-        &[("slowness", 400, 5), ("resistance", 400, 3)],
-    ),
-    p(
-        "water_breathing",
-        "water_breathing",
-        &[("water_breathing", 3600, 0)],
-    ),
-    p(
-        "long_water_breathing",
-        "water_breathing",
-        &[("water_breathing", 9600, 0)],
-    ),
-    p("healing", "healing", &[("instant_health", 1, 0)]),
-    p("strong_healing", "healing", &[("instant_health", 1, 1)]),
-    p("harming", "harming", &[("instant_damage", 1, 0)]),
-    p("strong_harming", "harming", &[("instant_damage", 1, 1)]),
-    p("poison", "poison", &[("poison", 900, 0)]),
-    p("long_poison", "poison", &[("poison", 1800, 0)]),
-    p("strong_poison", "poison", &[("poison", 432, 1)]),
-    p("regeneration", "regeneration", &[("regeneration", 900, 0)]),
-    p(
-        "long_regeneration",
-        "regeneration",
-        &[("regeneration", 1800, 0)],
-    ),
-    p(
-        "strong_regeneration",
-        "regeneration",
-        &[("regeneration", 450, 1)],
-    ),
-    p("strength", "strength", &[("strength", 3600, 0)]),
-    p("long_strength", "strength", &[("strength", 9600, 0)]),
-    p("strong_strength", "strength", &[("strength", 1800, 1)]),
-    p("weakness", "weakness", &[("weakness", 1800, 0)]),
-    p("long_weakness", "weakness", &[("weakness", 4800, 0)]),
-    p("luck", "luck", &[("luck", 6000, 0)]),
-    p("slow_falling", "slow_falling", &[("slow_falling", 1800, 0)]),
-    p(
-        "long_slow_falling",
-        "slow_falling",
-        &[("slow_falling", 4800, 0)],
-    ),
-    p("wind_charged", "wind_charged", &[("wind_charged", 3600, 0)]),
-    p("weaving", "weaving", &[("weaving", 3600, 0)]),
-    p("oozing", "oozing", &[("oozing", 3600, 0)]),
-    p("infested", "infested", &[("infested", 3600, 0)]),
-];
-pub fn potion(id: &str) -> Option<&'static PotionDef> {
-    let id = id.trim_start_matches("minecraft:");
-    POTIONS.iter().find(|p| p.id == id)
-}
-/// `PotionContents.BASE_POTION_COLOR` (ARGB -13083194) as RGB.
-pub const BASE_POTION_COLOR: u32 = 0x385DC6;
-/// `PotionContents.getColor`: amplifier-weighted mix of visible effect colours.
-pub fn potion_color(id: Option<&str>) -> u32 {
-    let Some(def) = id.and_then(potion) else {
-        return BASE_POTION_COLOR;
-    };
-    let (mut r, mut g, mut b, mut total) = (0u32, 0u32, 0u32, 0u32);
-    for (e, _, amp) in def.effects {
-        let Some(e) = effect(e) else { continue };
-        let w = *amp as u32 + 1;
-        r += w * (e.color >> 16 & 255);
-        g += w * (e.color >> 8 & 255);
-        b += w * (e.color & 255);
-        total += w;
-    }
-    match (
-        r.checked_div(total),
-        g.checked_div(total),
-        b.checked_div(total),
-    ) {
-        (Some(r), Some(g), Some(b)) => (r << 16) | (g << 8) | b,
-        _ => BASE_POTION_COLOR,
-    }
-}
+pub use horizon_client_core::potions::{
+    BASE_POTION_COLOR, Category, EFFECTS, EffectDef, POTIONS, PotionDef, effect, namespaced,
+    potion, potion_color,
+};
 /// `MobEffectUtil.formatDuration` at 20 TPS: m:ss or h:mm:ss.
 pub fn format_duration(ticks: i32) -> String {
    let secs = ticks / 20;
@@ -412,18 +191,6 @@ impl Brewing {
    }
 }

-/// `BrewingStandBlockEntity` state. Slots: 0-2 bottles, 3 ingredient, 4 fuel.
-#[derive(Clone, Debug, Default)]
-pub struct BrewingStand {
-    pub items: [Option<ItemStack>; 5],
-    pub brew_time: i32,
-    pub total_brew_time: i32,
-    pub fuel: i32,
-    pub total_fuel: i32,
-    pub speed: f32,
-    pub ingredient: Option<Arc<str>>,
-    pub last_bottles: Option<[bool; 3]>,
-}
 /// What a brewing tick asks the world to do.
 #[derive(Clone, Debug, Default, PartialEq)]
 pub struct BrewTick {
@@ -40,6 +40,8 @@ pub struct Interaction {
    /// The cauldron's new state.
    pub block: Option<BlockState>,
    pub sound: Option<&'static str>,
+    /// The custom statistic the player earns (`use_cauldron`, ...).
+    pub stat: Option<&'static str>,
 }

 fn state(name: &str, level: Option<u8>) -> BlockState {
@@ -57,6 +59,7 @@ fn pass() -> Interaction {
        outcome: Outcome::Pass,
        block: None,
        sound: None,
+        stat: None,
    }
 }

@@ -117,11 +120,12 @@ fn lowered(cauldron: &BlockState) -> BlockState {
    }
 }

-fn changed(block: BlockState, sound: Option<&'static str>) -> Interaction {
+fn changed(block: BlockState, sound: Option<&'static str>, stat: &'static str) -> Interaction {
    Interaction {
        outcome: Outcome::Success,
        block: Some(block),
        sound,
+        stat: Some(stat),
    }
 }

@@ -179,18 +183,22 @@ pub fn interact(
            stack.data_mut().dyed_color = None;
            stack.tidy();
        }
-        return changed(lowered(cauldron), None);
+        return changed(lowered(cauldron), None, "clean_armor");
    }
    let fill_bucket = |player: &mut dyn Player, new: &str, can_fill: bool, sound| {
        if !can_fill {
            return pass();
        }
        filled(player, ItemStack::new(new, 1), true);
-        changed(state("minecraft:cauldron", None), Some(sound))
+        changed(
+            state("minecraft:cauldron", None),
+            Some(sound),
+            "use_cauldron",
+        )
    };
    let empty_bucket = |player: &mut dyn Player, block: BlockState, sound| {
        filled(player, ItemStack::new("minecraft:bucket", 1), true);
-        changed(block, Some(sound))
+        changed(block, Some(sound), "fill_cauldron")
    };
    match item {
        "minecraft:lava_bucket" => {
@@ -199,6 +207,7 @@ pub fn interact(
                    outcome: Outcome::Consume,
                    block: None,
                    sound: None,
+                    stat: None,
                }
            } else {
                empty_bucket(
@@ -221,6 +230,7 @@ pub fn interact(
                    outcome: Outcome::Consume,
                    block: None,
                    sound: None,
+                    stat: None,
                }
            } else {
                empty_bucket(
@@ -241,6 +251,7 @@ pub fn interact(
            changed(
                state("minecraft:water_cauldron", Some(1)),
                Some("minecraft:item.bottle.empty"),
+                "use_cauldron",
            )
        }
        ("water", "minecraft:bucket") => fill_bucket(
@@ -255,7 +266,11 @@ pub fn interact(
                ItemStack::new("minecraft:potion", 1).with_potion("minecraft:water"),
                true,
            );
-            changed(lowered(cauldron), Some("minecraft:item.bottle.fill"))
+            changed(
+                lowered(cauldron),
+                Some("minecraft:item.bottle.fill"),
+                "use_cauldron",
+            )
        }
        ("water", "minecraft:potion") => {
            if level == 3 || !water_potion {
@@ -266,7 +281,7 @@ pub fn interact(
            // BlockState.cycle on a 1..=3 property
            next.properties
                .insert("level".into(), (level % 3 + 1).to_string());
-            changed(next, Some("minecraft:item.bottle.empty"))
+            changed(next, Some("minecraft:item.bottle.empty"), "use_cauldron")
        }
        ("water", name)
            if name
@@ -283,7 +298,7 @@ pub fn interact(
            cleaned.data_mut().banner_patterns.pop();
            cleaned.tidy();
            filled(player, cleaned, false);
-            changed(lowered(cauldron), None)
+            changed(lowered(cauldron), None, "clean_banner")
        }
        ("water", name)
            if name
@@ -292,7 +307,7 @@ pub fn interact(
                .is_some_and(|c| COLORS.contains(&c)) =>
        {
            filled(player, held.transmute("minecraft:shulker_box", 1), false);
-            changed(lowered(cauldron), None)
+            changed(lowered(cauldron), None, "clean_shulker_box")
        }
        ("lava", "minecraft:bucket") => fill_bucket(
            player,
@@ -16,6 +16,9 @@ use crate::{
 #[path = "chat_tests.rs"]
 mod tests;

+/// `CommandHistory.PERSISTED_COMMANDS_FILE_NAME` and its size cap.
+const COMMAND_HISTORY_FILE: &str = "command_history.txt";
+const MAX_PERSISTED_COMMAND_HISTORY: usize = 50;
 /// GuiMessageTag.systemSinglePlayer's indicator colour.
 pub const SYSTEM_INDICATOR: u32 = 0xD0D0D0;

@@ -80,6 +83,10 @@ impl ChatAbilities {
            ChatSource::Client => true,
        }
    }
+    /// `ChatAbilities.hasAnyRestrictions`: the Chat option takes something.
+    pub fn any_restriction(&self) -> bool {
+        *self != Self::new(ChatVisibility::Full)
+    }
    /// Whether the chat screen may send `input` (`hasAllowedInput`).
    pub fn allows(&self, input: &str) -> bool {
        if input.starts_with('/') {
@@ -185,6 +192,10 @@ pub struct Chat {
    lines: Vec<Line>,
    /// Sent messages and commands (ChatComponent.recentChat).
    pub recent: Vec<String>,
+    /// `CommandHistory`: the last commands, kept in `command_history.txt`
+    /// in the game folder once `load_history` has set it.
+    commands: Vec<String>,
+    history_file: Option<std::path::PathBuf>,
    scroll: usize,
    new_since_scroll: bool,
    pub options: ChatOptions,
@@ -310,6 +321,17 @@ impl Chat {
        self.lines.clear();
        self.scroll = 0;
    }
+    /// `new CommandHistory(gameFolder)`: the commands kept from earlier runs
+    /// start the chat's history (`ChatComponent`'s constructor).
+    pub fn load_history(&mut self, game_folder: &std::path::Path) {
+        let file = game_folder.join(COMMAND_HISTORY_FILE);
+        if let Ok(text) = std::fs::read_to_string(&file) {
+            self.commands = text.lines().map(str::to_owned).collect();
+            self.recent.extend(self.commands.iter().cloned());
+        }
+        self.history_file = Some(file);
+    }
+    /// `ChatComponent.addRecentChat`: a command also goes to the saved history.
    pub fn add_recent(&mut self, message: &str) {
        if self.recent.last().map(String::as_str) != Some(message) {
            if self.recent.len() >= 100 {
@@ -317,6 +339,21 @@ impl Chat {
            }
            self.recent.push(message.to_owned());
        }
+        if message.starts_with('/') && self.commands.last().map(String::as_str) != Some(message) {
+            if self.commands.len() >= MAX_PERSISTED_COMMAND_HISTORY {
+                self.commands.remove(0);
+            }
+            self.commands.push(message.to_owned());
+            if let Some(file) = &self.history_file {
+                let mut text = self.commands.join("\n");
+                text.push('\n');
+                if let Err(e) = std::fs::write(file, text) {
+                    log::error!(
+                        "Failed to write {COMMAND_HISTORY_FILE}, command history will be missing: {e}"
+                    );
+                }
+            }
+        }
    }
    pub fn reset_scroll(&mut self) {
        self.scroll = 0;
@@ -438,10 +475,71 @@ impl Chat {
        out.push(GuiDraw::Pop);
        out
    }
-    /// Draws [`Chat::layout`] into the HUD batch.
+    /// Draws [`Chat::layout`] into the HUD batch, and with the chat screen
+    /// open the restricted prompt above the lines.
    pub fn draw(&self, batch: &mut HudBatch, atlas: &HudAtlas, ticks: u64, focused: bool) {
        let draws = self.layout(batch.height as i32, ticks, focused);
        hud_layout::paint(batch, atlas, &draws);
+        if focused && self.abilities.any_restriction() {
+            let prompt = self.restricted_prompt(&atlas.font, batch.height as i32);
+            hud_layout::paint(batch, atlas, &prompt);
+        }
+    }
+    /// `ChatComponent.extractRenderState` for `FOREGROUND_RESTRICTED`: a
+    /// background row and the red, underlined "Chat is restricted" line in
+    /// the row above the messages, clipped to the chat's width.
+    fn restricted_prompt(&self, font: &crate::font::Font, height: i32) -> Vec<GuiDraw> {
+        let o = &self.options;
+        let scale = o.scale as f32;
+        let max_width = hud_layout::ceil(o.width_px() as f32 / scale);
+        let chat_bottom = hud_layout::floor((height - 40) as f32 / scale);
+        let entry_height = o.line_height();
+        let bottom_to_text =
+            (8.0 * (o.line_spacing + 1.0) - 4.0 * o.line_spacing + 0.5).floor() as i32;
+        let shown = self
+            .lines
+            .len()
+            .saturating_sub(self.scroll)
+            .min(self.lines_per_page(true));
+        let top = chat_bottom - (shown as i32 + 1) * entry_height;
+        let mut prompt = Text::translate("chat_screen.restricted", &[]).with_style(&Style {
+            color: Some(text::RED),
+            underlined: Some(true),
+            ..Style::default()
+        });
+        // ComponentRenderUtils.clipText.
+        let mut width = 0.0;
+        let fits = prompt
+            .chars()
+            .take_while(|(c, style)| {
+                width += font.advance(*c, style);
+                width <= max_width as f32
+            })
+            .count();
+        if fits < prompt.chars().count() {
+            prompt = prompt.slice(0, fits);
+        }
+        vec![
+            GuiDraw::Push(vec![
+                PoseOp::Scale(scale, scale),
+                PoseOp::Translate(4.0, 0.0),
+            ]),
+            hud_layout::fill(
+                -2,
+                top,
+                max_width + 4 + 4,
+                top + entry_height,
+                hud_layout::as8(o.background_opacity as f32) << 24,
+            ),
+            GuiDraw::Text {
+                text: prompt,
+                x: 0,
+                y: top + entry_height - bottom_to_text - 1,
+                color: hud_layout::white(o.opacity as f32 * 0.9 + 0.1),
+                shadow: true,
+            },
+            GuiDraw::Pop,
+        ]
    }
    /// The click action under a GUI-space cursor while chat is focused.
    pub fn click_at(
@@ -458,26 +556,34 @@ impl Chat {
    pub fn hover_at(&self, font: &crate::font::Font, height: i32, x: f64, y: f64) -> Option<Text> {
        self.style_at(font, height, x, y)?.hover.map(|h| *h)
    }
-    /// ChatComponent.getClickedComponentStyleAt.
-    fn style_at(
-        &self,
-        font: &crate::font::Font,
-        height: i32,
-        x: f64,
-        y: f64,
-    ) -> Option<crate::text::Style> {
+    /// The wrapped line under a GUI-space cursor while chat is focused, and
+    /// the cursor's x within it (the text starts at 0).
+    fn line_at(&self, height: i32, x: f64, y: f64) -> Option<(&Line, f64)> {
        let scale = self.options.scale as f32;
-        let mut x = x / f64::from(scale) - 4.0;
+        let x = x / f64::from(scale) - 4.0;
        let bottom = hud_layout::floor((height - 40) as f32 / scale);
        let from_bottom = f64::from(bottom) - y / f64::from(scale);
-        if x < 0.0 || x >= f64::from(self.max_width()) || from_bottom <= 0.0 {
+        if x >= f64::from(self.max_width()) || from_bottom <= 0.0 {
            return None;
        }
        let row = (from_bottom / f64::from(self.options.line_height())).ceil() as usize - 1;
        if row >= self.lines_per_page(true) {
            return None;
        }
-        let line = self.lines.get(self.scroll + row)?;
+        Some((self.lines.get(self.scroll + row)?, x))
+    }
+    /// ChatComponent.getClickedComponentStyleAt.
+    pub fn style_at(
+        &self,
+        font: &crate::font::Font,
+        height: i32,
+        x: f64,
+        y: f64,
+    ) -> Option<crate::text::Style> {
+        let (line, mut x) = self.line_at(height, x, y)?;
+        if x < 0.0 {
+            return None;
+        }
        let content = line.content.resolve_legacy();
        for (c, style) in content.chars() {
            x -= f64::from(font.advance(c, style));
@@ -487,6 +593,13 @@ impl Chat {
        }
        None
    }
+    /// Whether the cursor is on a line's indicator bar while chat is focused
+    /// (`DrawingFocusedGraphicsAccess.handleTag`), whose tooltip is the
+    /// message tag's text.
+    pub fn indicator_at(&self, height: i32, x: f64, y: f64) -> bool {
+        self.line_at(height, x, y)
+            .is_some_and(|(line, x)| line.indicator.is_some() && (-4.0..-2.0).contains(&x))
+    }
    /// Plain text of the newest messages (for tests and the control socket).
    pub fn recent_lines(&self, n: usize) -> Vec<String> {
        self.messages
@@ -2,9 +2,12 @@
 //! threads can mesh and light immutable snapshots while the game thread edits
 //! (copy-on-write through `Arc::make_mut`).
 use horizon_core::paletted::{PalettedContainer, Strategy};
+use horizon_world::nbt::{Compound, Tag};
 use horizon_world::registry::BlockStateId;
 use std::sync::{Arc, OnceLock};

+pub mod block_entity;
+
 pub const MIN_Y: i32 = -64;
 pub const HEIGHT: i32 = 384;
 pub const SECTIONS: usize = (HEIGHT / 16) as usize;
@@ -148,19 +151,22 @@ pub struct Chunk {
    /// Newly generated (not loaded from a save): eligible for generation-time spawns.
    pub fresh: bool,
    /// Block entities read from a save, moved into the world on arrival.
-    pub block_entities: Vec<((i32, i32, i32), crate::containers::BlockEntity)>,
+    pub block_entities: Vec<((i32, i32, i32), block_entity::BlockEntity)>,
    /// `CustomName` of the container block entities (shown as the screen title).
    pub block_names: Vec<((i32, i32, i32), String)>,
    /// Generation postprocessing marks (ProtoChunk.postProcessing) as world
    /// positions, applied once by LevelChunk.postProcessGeneration.
    pub postprocess: Vec<[i32; 3]>,
    /// Saved data Horizon keeps but does not simulate (save.rs).
-    pub saved: Option<Arc<crate::save::ChunkExtras>>,
+    pub saved: Option<Arc<ChunkExtras>>,
    /// Entities read from a save (vanilla entity NBT), spawned on arrival.
    pub entities: Vec<horizon_world::nbt::Tag>,
    /// Structure starts reaching into this chunk (`structures.References`):
    /// structure id and the start's chunk.
    pub structure_refs: Vec<(Arc<str>, (i32, i32))>,
+    /// The starts generation made in this chunk (`structures.starts`), saved
+    /// with the state their placement has reached by then.
+    pub structure_starts: Vec<Arc<horizon_world::worldgen::structure::start::StructureStart>>,
 }
 impl Chunk {
    pub fn empty(x: i32, z: i32) -> Self {
@@ -178,6 +184,7 @@ impl Chunk {
            block_entities: Vec::new(),
            block_names: Vec::new(),
            structure_refs: Vec::new(),
+            structure_starts: Vec::new(),
            postprocess: Vec::new(),
            saved: None,
            entities: Vec::new(),
@@ -305,6 +312,76 @@ impl Chunk {
    }
 }

+/// A proto chunk saved before it became final. Decoration writes into a
+/// chunk's neighbours, and decorated chunks wait for theirs, so the chunks
+/// past the finished ones hold writes that generating them again would lose
+/// (whole structure pieces, trees, ores). Vanilla saves its proto chunks too.
+pub struct SavedProto {
+    /// Blocks, scheduled ticks (in `saved`) and post-processing marks.
+    pub column: Chunk,
+    /// Decorated itself (`features`), not only written to by its neighbours
+    /// (`terrain`).
+    pub decorated: bool,
+    /// Block entity data in placement order, with `x`, `y` and `z`.
+    pub block_entities: Vec<Tag>,
+    /// Entities placed by structures, with absolute `Pos`.
+    pub entities: Vec<Tag>,
+}
+
+/// A container's loot table and what Horizon rolled from it. Vanilla keeps
+/// `LootTable` and `LootTableSeed` until the container is first opened;
+/// Horizon rolls when it generates or loads the chunk, and saves the table
+/// again while the container still holds exactly the rolled items.
+#[derive(Clone, Debug, PartialEq)]
+pub struct RolledLoot {
+    pub pos: (i32, i32, i32),
+    pub table: String,
+    /// The saved `LootTableSeed`, written back unless 0 (trySaveLootTable).
+    pub seed: Option<i64>,
+    /// The rolled `Items`.
+    pub items: Tag,
+}
+impl RolledLoot {
+    /// Puts the loot table back in place of `Items` while they are still the
+    /// roll; false once the container holds anything else.
+    pub fn restore(&self, map: &mut Compound) -> bool {
+        if map.get(&"Items".into()) != Some(&self.items) {
+            return false;
+        }
+        map.remove(&"Items".into());
+        map.insert("LootTable".into(), Tag::String(self.table.as_str().into()));
+        if let Some(seed) = self.seed.filter(|s| *s != 0) {
+            map.insert("LootTableSeed".into(), Tag::Long(seed));
+        }
+        true
+    }
+}
+
+/// Save data loaded with a chunk that Horizon keeps but does not simulate.
+#[derive(Clone, Debug, Default)]
+pub struct ChunkExtras {
+    /// Chunk root keys written back as loaded (structures, PostProcessing,
+    /// InhabitedTime, blending data, ...).
+    pub root: Compound,
+    /// Block entities Horizon does not model.
+    pub block_entities: Vec<Tag>,
+    /// The NBT of the modelled block entities as loaded, to restore the fields and
+    /// detail Horizon does not model when it saves them (`block_entity_nbt::overlay`).
+    pub block_entity_sources: Vec<((i32, i32, i32), Tag)>,
+    /// Every saved block entity's position in the order of the save's list,
+    /// the order `SerializableChunkData` puts them in the chunk's maps.
+    pub block_entity_order: Vec<(i32, i32, i32)>,
+    /// Scheduled ticks (`block_ticks`/`fluid_ticks`): delays relative to the
+    /// save time. Registered with the level's tick scheduler on arrival and
+    /// replaced with the scheduler's pending ticks when saving.
+    pub block_ticks: Vec<horizon_core::ticks::SavedTick>,
+    pub fluid_ticks: Vec<horizon_core::ticks::SavedTick>,
+    /// Game time written as `LastUpdate`.
+    pub last_update: i64,
+    /// Containers still holding their loot table's roll.
+    pub rolled_loot: Vec<RolledLoot>,
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -0,0 +1,409 @@
+//! Block entity data: what a chunk stores for its block entities (`BlockEntity`
+//! and its payloads). Plain data, as vanilla's block entities are world data;
+//! their behaviour lives with the features that use them (`containers`,
+//! `brewing`, `signs`, ...), which re-export these types under their old paths.
+use horizon_client_core::{text::Text, who::Who};
+use horizon_items::{banner_layer::BannerLayer, items::ItemStack};
+use horizon_world::{
+    level::sculk::SculkSpreader,
+    nbt::{Compound, Tag},
+};
+use std::{collections::HashMap, sync::Arc};
+
+/// An entity's UUID as its four ints (`UUIDUtil.CODEC`).
+pub type Uuid = [i32; 4];
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum FurnaceKind {
+    Furnace,
+    BlastFurnace,
+    Smoker,
+}
+#[derive(Clone, Debug)]
+pub struct Furnace {
+    pub kind: FurnaceKind,
+    /// input, fuel, result
+    pub items: [Option<ItemStack>; 3],
+    pub lit_remaining: i32,
+    pub lit_total: i32,
+    pub cooking_timer: i32,
+    pub cooking_total: i32,
+    pub speed: f32,
+    /// `AbstractFurnaceBlockEntity.recipesUsed`: how many of each recipe this furnace has
+    /// made since a player last took from its output. The experience is owed per recipe
+    /// rather than per item, and a save keeps it as the `RecipesUsed` compound.
+    pub recipes_used: HashMap<String, u32>,
+}
+#[derive(Clone, Debug)]
+pub enum BlockEntity {
+    Chest(Vec<Option<ItemStack>>),
+    Furnace(Furnace),
+    Brewing(Box<BrewingStand>),
+    /// Signs and hanging signs (`SignBlockEntity`).
+    Sign(SignData),
+    /// `JukeboxBlockEntity`: the record and its `JukeboxSongPlayer`.
+    Jukebox(Jukebox),
+    /// `BeaconBlockEntity`.
+    Beacon(Box<Beacon>),
+    /// `LecternBlockEntity`: the book and the open page.
+    Lectern(Lectern),
+    /// Sculk sensors, shriekers and catalysts (`crate::sculk`).
+    Sculk(Box<SculkEntity>),
+    /// `CreakingHeartBlockEntity`: its protector and the hurt emitter.
+    CreakingHeart(Box<CreakingHeart>),
+    /// `BannerBlockEntity`: the pattern layers.
+    Banner(Banner),
+    /// `CrafterBlockEntity`.
+    Crafter(Crafter),
+    /// `SpawnerBlockEntity` (`crate::mobs::spawner`).
+    Spawner(Box<Spawner>),
+    /// `TrialSpawnerBlockEntity` (`crate::mobs::trial_spawner`).
+    TrialSpawner(Box<TrialSpawner>),
+    /// `VaultBlockEntity` (`crate::vault`).
+    Vault(Box<Vault>),
+    /// `BeehiveBlockEntity` of beehives and bee nests (`crate::beehive`).
+    Beehive(Box<Beehive>),
+    /// `CommandBlockEntity` of the three command blocks (`crate::command_block`).
+    CommandBlock(Box<CommandBlock>),
+    /// `CampfireBlockEntity` of campfires and soul campfires.
+    Campfire(Box<Campfire>),
+    /// `SkullBlockEntity` of every skull and head block.
+    Skull(Skull),
+    /// `TheEndGatewayBlockEntity`: its age and configured destination.
+    EndGateway(EndGateway),
+    /// `DaylightDetectorBlockEntity`: no data, only the ticker
+    /// (`DaylightDetectorBlock.tickEntity`).
+    DaylightDetector,
+    /// `ChiseledBookShelfBlockEntity`: a `Container` of six one-book slots.
+    ChiseledBookshelf(Box<ChiseledBookshelf>),
+}
+/// `ChiseledBookShelfBlockEntity`: six slots and `lastInteractedSlot`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct ChiseledBookshelf {
+    pub items: [Option<ItemStack>; 6],
+    pub last_slot: i32,
+}
+impl Default for ChiseledBookshelf {
+    fn default() -> Self {
+        Self {
+            items: Default::default(),
+            last_slot: -1,
+        }
+    }
+}
+/// `TheEndGatewayBlockEntity`.
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct EndGateway {
+    pub age: i64,
+    pub exit_portal: Option<[i32; 3]>,
+    pub exact_teleport: bool,
+}
+/// `CampfireBlockEntity`: four cooking slots, each with its
+/// `cookingProgress` and `cookingTime` (the recipe's).
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Campfire {
+    pub items: [Option<ItemStack>; 4],
+    pub progress: [i32; 4],
+    pub total: [i32; 4],
+}
+/// `SkullBlockEntity`: the player profile the head shows (kept as loaded:
+/// a compound, or a string when it names a player only), the note block
+/// sound and `custom_name`.
+#[derive(Clone, Debug, Default)]
+pub struct Skull {
+    pub profile: Option<horizon_world::nbt::Tag>,
+    pub note_block_sound: Option<String>,
+    pub custom_name: Option<horizon_world::nbt::Tag>,
+    /// What `profile` draws, read from it once rather than every frame.
+    pub skin: Option<SkullSkin>,
+}
+/// `SkullBlockRenderer.getPlayerSkin` of a head's profile: its skin's URL
+/// with the `skins/<sha1>` sprite it downloads to, and the
+/// `DefaultPlayerSkin` drawn until that sprite is there (steve for a
+/// profile with no id).
+#[derive(Clone, Debug)]
+pub struct SkullSkin {
+    pub download: Option<(String, String)>,
+    /// `ResolvableProfile.nameOrId` when the profile is `Dynamic` (a name or
+    /// an id only): the key `skins::Resolver` resolves it by.
+    pub dynamic: Option<NameOrId>,
+    pub fallback: &'static str,
+}
+/// `Either<String, UUID>`: the key a `Dynamic` `ResolvableProfile` resolves
+/// by (`ResolvableProfile.nameOrId`).
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub enum NameOrId {
+    Name(String),
+    Id(u128),
+}
+/// `CrafterBlockEntity`: nine slots that can be disabled, the powered flag
+/// and the ticks left in the crafting animation.
+#[derive(Clone, Debug, Default)]
+pub struct Crafter {
+    pub items: [Option<ItemStack>; 9],
+    pub disabled: [bool; 9],
+    pub triggered: bool,
+    pub crafting_ticks: i32,
+    /// The block state's `triggered` when last ticked (not saved): the block
+    /// entity flag follows it only when it changes (`CrafterBlock.neighborChanged`).
+    pub state_triggered: Option<bool>,
+}
+#[derive(Clone, Debug, Default)]
+pub struct Banner {
+    pub layers: Vec<BannerLayer>,
+    pub name: Option<String>,
+    /// Components not consumed by BannerBlockEntity's implicit fields.
+    pub components: horizon_world::nbt::Compound,
+}
+/// `CreakingHeartBlockEntity` (the logic is in `game/creaking.rs`).
+#[derive(Clone, Debug, Default)]
+pub struct CreakingHeart {
+    /// The protector: its entity id once resolved, and its UUID (the saved form).
+    pub creaking: Option<(Option<u32>, [i32; 4])>,
+    pub ticks_existed: i64,
+    pub ticker: i32,
+    /// Ticks left of the hurt effect (`emitter`) and where it heads.
+    pub emitter: i32,
+    pub emitter_target: Option<[f64; 3]>,
+    pub output_signal: i32,
+}
+#[derive(Clone, Debug, Default)]
+pub struct Lectern {
+    pub book: Option<ItemStack>,
+    pub page: i32,
+}
+#[derive(Clone, Debug, Default)]
+pub struct Beacon {
+    pub levels: i32,
+    /// Effect ids (`minecraft:speed`).
+    pub primary: Option<String>,
+    pub secondary: Option<String>,
+    /// Beam sections (RGB colour, height) and the ones being rebuilt.
+    pub sections: Vec<(u32, i32)>,
+    pub checking: Vec<(u32, i32)>,
+    pub last_check_y: i32,
+}
+#[derive(Clone, Debug, Default)]
+pub struct Jukebox {
+    pub record: Option<ItemStack>,
+    /// `ticks_since_song_started`, while a song plays.
+    pub ticks: i64,
+    pub playing: bool,
+}
+/// `BrewingStandBlockEntity` state. Slots: 0-2 bottles, 3 ingredient, 4 fuel.
+#[derive(Clone, Debug, Default)]
+pub struct BrewingStand {
+    pub items: [Option<ItemStack>; 5],
+    pub brew_time: i32,
+    pub total_brew_time: i32,
+    pub fuel: i32,
+    pub total_fuel: i32,
+    pub speed: f32,
+    pub ingredient: Option<Arc<str>>,
+    pub last_bottles: Option<[bool; 3]>,
+}
+/// One sign side (`SignText`).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct SignText {
+    pub lines: [String; 4],
+    /// `DyeColor` id.
+    pub color: u8,
+    pub glowing: bool,
+}
+/// `SignBlockEntity` / `HangingSignBlockEntity` data.
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub struct SignData {
+    pub hanging: bool,
+    pub front: SignText,
+    pub back: SignText,
+    pub waxed: bool,
+}
+/// `VibrationInfo`.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Info {
+    pub event: &'static str,
+    pub distance: f32,
+    pub pos: [f64; 3],
+    pub source: Option<Who>,
+    pub owner: Option<Who>,
+}
+/// `VibrationSelector`: the closest, then highest-frequency candidate of a tick.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Selector {
+    pub(crate) current: Option<(Info, i64)>,
+}
+/// `VibrationSystem.Data`.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Data {
+    pub current: Option<Info>,
+    pub travel: i32,
+    pub selector: Selector,
+}
+/// Which sculk block entity this is.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum SculkKind {
+    Sensor,
+    Calibrated,
+    Shrieker,
+    Catalyst,
+}
+/// `SculkSensorBlockEntity`, `CalibratedSculkSensorBlockEntity`,
+/// `SculkShriekerBlockEntity` and `SculkCatalystBlockEntity`.
+#[derive(Clone, Debug)]
+pub struct SculkEntity {
+    pub kind: SculkKind,
+    pub vibration: Data,
+    /// `last_vibration_frequency` (sensors).
+    pub last_frequency: i32,
+    /// `warning_level` (shriekers).
+    pub warning_level: i32,
+    /// The catalyst's charge cursors.
+    pub spreader: SculkSpreader,
+}
+/// `SpawnData.CustomSpawnRules`: the block and sky light the spawn block
+/// must have (inclusive ranges within 0..=15).
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct CustomSpawnRules {
+    pub block: (i32, i32),
+    pub sky: (i32, i32),
+}
+/// `SpawnData`: the entity to spawn, optional light rules and an equipment
+/// table (kept as loaded).
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct SpawnData {
+    pub entity: Compound,
+    pub custom_spawn_rules: Option<CustomSpawnRules>,
+    pub equipment: Option<Tag>,
+}
+/// Which `SpawnData` is next: one of the potentials (the same object in
+/// vanilla, so changing it changes the potential) or its own.
+#[derive(Clone, Debug, PartialEq)]
+pub(crate) enum Next {
+    Potential(usize),
+    Own(SpawnData),
+}
+/// `BaseSpawner`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Spawner {
+    pub spawn_delay: i32,
+    /// `SpawnPotentials`: data and weight.
+    pub potentials: Vec<(SpawnData, i32)>,
+    pub(crate) next: Option<Next>,
+    pub min_spawn_delay: i32,
+    pub max_spawn_delay: i32,
+    pub spawn_count: i32,
+    pub max_nearby_entities: i32,
+    pub required_player_range: i32,
+    pub spawn_range: i32,
+    /// The client copy's delay (`spawnDelay` on the client level), which
+    /// speeds the spin up as the next spawn nears.
+    pub client_delay: i32,
+    pub spin: f64,
+    pub o_spin: f64,
+}
+/// `TrialSpawnerConfig`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct TrialConfig {
+    pub spawn_range: i32,
+    pub total_mobs: f32,
+    pub simultaneous_mobs: f32,
+    pub total_mobs_added_per_player: f32,
+    pub simultaneous_mobs_added_per_player: f32,
+    pub ticks_between_spawn: i32,
+    pub spawn_potentials: Vec<(SpawnData, i32)>,
+    pub loot_tables_to_eject: Vec<(String, i32)>,
+    pub items_to_drop_when_ominous: String,
+}
+/// A `Holder<TrialSpawnerConfig>` as saved: a registry id
+/// (`minecraft:trial_chamber/breeze/normal`) or an inline config.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct ConfigSlot {
+    /// The value as loaded, written back as is; None for the default.
+    pub saved: Option<Tag>,
+    pub config: TrialConfig,
+}
+/// `TrialSpawner` with its `TrialSpawnerStateData`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct TrialSpawner {
+    pub normal: ConfigSlot,
+    pub ominous: ConfigSlot,
+    pub target_cooldown_length: i32,
+    pub required_player_range: i32,
+    pub detected_players: Vec<Uuid>,
+    pub current_mobs: Vec<Uuid>,
+    pub cooldown_ends_at: i64,
+    pub next_mob_spawns_at: i64,
+    pub total_mobs_spawned: i32,
+    pub next_spawn_data: Option<SpawnData>,
+    pub ejecting_loot_table: Option<String>,
+    /// `isOminous`, set from the block on every server tick.
+    pub is_ominous: bool,
+    /// The server's display entity exists (`getOrCreateDisplayEntity`): it is
+    /// made once per loaded block entity and kept.
+    pub has_display: bool,
+    pub spin: f64,
+    pub o_spin: f64,
+    /// `getDispensingItems`, kept once rolled (not saved): the ominous items
+    /// and their weights (the rolled counts).
+    pub dispensing: Option<Vec<ItemStack>>,
+}
+/// `VaultConfig`.
+#[derive(Clone, Debug, PartialEq)]
+pub struct VaultConfig {
+    pub loot_table: String,
+    pub activation_range: f64,
+    pub deactivation_range: f64,
+    /// None when the config has no key (`ItemStack.EMPTY`): the vault never opens.
+    pub key_item: Option<ItemStack>,
+    pub override_loot_table_to_display: Option<String>,
+}
+/// `VaultBlockEntity`: its config, server data and shared data.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Vault {
+    pub config: VaultConfig,
+    /// `VaultServerData`, oldest rewarded player first.
+    pub rewarded_players: Vec<Uuid>,
+    pub state_updating_resumes_at: i64,
+    /// Popped from the end.
+    pub items_to_eject: Vec<ItemStack>,
+    pub total_ejections_needed: i32,
+    pub last_insert_fail_timestamp: i64,
+    /// `VaultSharedData`.
+    pub display_item: Option<ItemStack>,
+    pub connected_players: Vec<Uuid>,
+    pub connected_particles_range: f64,
+    /// The shared data changed since the last tick sent it.
+    pub shared_dirty: bool,
+    /// `VaultClientData`: the display item's spin and the previous tick's, in degrees.
+    pub spin: f32,
+    pub o_spin: f32,
+}
+/// `BeehiveBlockEntity`: the bees inside and the flower one of them knew.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Beehive {
+    pub bees: Vec<Occupant>,
+    pub flower: Option<[i32; 3]>,
+}
+/// `BeehiveBlockEntity.Occupant`: a bee's tag (with its `id`), its time in
+/// the hive and the time it stays at least.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Occupant {
+    pub entity_data: Tag,
+    pub ticks_in_hive: i32,
+    pub min_ticks_in_hive: i32,
+}
+#[derive(Clone, Debug, PartialEq)]
+pub struct CommandBlock {
+    pub command: String,
+    pub success_count: i32,
+    /// `CustomName` as saved (a text component).
+    pub custom_name: Option<Tag>,
+    pub track_output: bool,
+    pub last_output: Option<Text>,
+    pub update_last_execution: bool,
+    /// The game time of the last run, -1 for none.
+    pub last_execution: i64,
+    pub powered: bool,
+    pub auto: bool,
+    pub condition_met: bool,
+}
@@ -76,14 +76,11 @@ impl<'a> IntoIterator for &'a ChunkMap {
    }
 }
 impl crate::light::LightWorld for ChunkMap {
-    fn state(&self, x: i32, y: i32, z: i32) -> Option<u32> {
-        self.columns.state(x, y, z)
+    fn section(&self, cx: i32, s: usize, cz: i32) -> Option<&Arc<crate::chunk::Section>> {
+        self.columns.section(cx, s, cz)
    }
-    fn light(&self, x: i32, y: i32, z: i32) -> Option<u8> {
-        self.columns.light(x, y, z)
-    }
-    fn set_light(&mut self, x: i32, y: i32, z: i32, packed: u8) {
-        self.columns.set_light(x, y, z, packed);
+    fn set_section_light(&mut self, cx: i32, s: usize, cz: i32, light: crate::chunk::Light) {
+        self.columns.set_section_light(cx, s, cz, light);
    }
 }

@@ -106,7 +103,13 @@ mod tests {
        for column in map.values_mut() {
            Arc::make_mut(column).light_loaded = true;
        }
-        crate::light::LightWorld::set_light(&mut map, 0, 0, 0, 0);
+        crate::light::LightWorld::set_section_light(
+            &mut map,
+            0,
+            0,
+            0,
+            crate::chunk::Light::Uniform(0),
+        );
        assert_eq!(inserted, map.membership_revision());
        map.remove(&(0, 0));
        map.insert((1, 0), chunk);
@@ -179,6 +179,8 @@ impl Mesh {
                        layer: 4,
                        color: u32::MAX,
                        light: shade,
+
+                        glint_uv: [0.0, 0.0],
                    });
                }
            };
@@ -54,6 +54,27 @@ fn strider_liquid_shape() -> VoxelShape {
    VoxelShape::from_cube([1, 2, 1], &[true, false]).expect("a valid half-block column")
 }

+// Vanilla scopes this direction to Entity.move while a piston pushes it.
+thread_local! {
+    static PISTON_NOCLIP: std::cell::Cell<Option<horizon_core::geometry::Direction>> = const { std::cell::Cell::new(None) };
+}
+
+/// Suppress the moving part of pistons moving in this direction during a push.
+pub fn with_piston_noclip<T>(
+    direction: horizon_core::geometry::Direction,
+    f: impl FnOnce() -> T,
+) -> T {
+    struct Reset(Option<horizon_core::geometry::Direction>);
+    impl Drop for Reset {
+        fn drop(&mut self) {
+            PISTON_NOCLIP.with(|value| value.set(self.0));
+        }
+    }
+    let previous = PISTON_NOCLIP.with(|value| value.replace(Some(direction)));
+    let _reset = Reset(previous);
+    f()
+}
+
 pub struct SceneCollisions<'w, 'r> {
    pub world: &'w World,
    pub binding: &'w BlockCollisionRegistry<'r>,
@@ -140,8 +161,21 @@ impl<W: EntityMovementWorld<Error = io::Error>> EntityMovementWorld for EntityCo
        border.collision_shape().map(Some).map_err(io::Error::other)
    }
 }
-impl EntityCollisions<'_, SceneCollisions<'_, '_>> {
-    /// `SceneCollisions::resolve` that also stops at the entity boxes.
+impl<'a, W> EntityCollisions<'a, W>
+where
+    W: BlockCollisionWorld<Error = io::Error> + EntityMovementWorld<Error = io::Error>,
+{
+    /// `EntityCollisions` for a body the world border also stops: the border
+    /// and the body's own x and z (`WorldBorder.isInsideCloseToBorder`).
+    pub fn with_border(blocks: W, border: &'a BorderGeometry, at: [f64; 2]) -> Self {
+        Self {
+            blocks,
+            entities: &[],
+            border: Some((border, at)),
+        }
+    }
+    /// `SceneCollisions::resolve` that also stops at the entity boxes and,
+    /// with a border, at the world border's walls.
    pub fn resolve(
        &mut self,
        bounds: Aabb,
@@ -149,12 +183,11 @@ impl EntityCollisions<'_, SceneCollisions<'_, '_>> {
        max_step: f32,
        on_ground: bool,
    ) -> Result<Vec3> {
-        let context = self.blocks.context(bounds);
        Ok(resolve_world_movement(
            self,
            MovementRequest {
                entity: EntityIdentity(0),
-                context,
+                context: CollisionContext::position(bounds.min_position().y),
                bounds,
                movement,
                max_step,
@@ -324,7 +357,7 @@ impl DynamicSupportWorld for SceneCollisions<'_, '_> {
            return Ok(None);
        };
        pistons
-            .collision_shape(self, p, piston, None)
+            .collision_shape(self, p, piston, PISTON_NOCLIP.with(|value| value.get()))
            .map(Some)
            .map_err(io::Error::other)
    }
@@ -388,6 +421,42 @@ impl PowderSnowWorld for SceneCollisions<'_, '_> {
    }
 }

+/// A collision world without blocks: no chunk is resident, so only the
+/// world border stops a body.
+pub struct EmptyCollisions;
+
+impl BlockCollisionWorld for EmptyCollisions {
+    type Error = io::Error;
+    type Chunk = ChunkPos;
+    fn collision_chunk(&mut self, _: ChunkPos) -> io::Result<Option<ChunkPos>> {
+        Ok(None)
+    }
+    fn collision_block(&mut self, _: ChunkPos, _: BlockPos) -> io::Result<CollisionBlock> {
+        Err(io::Error::other("no chunk is resident"))
+    }
+    fn is_suffocating(&mut self, _: ChunkPos, _: CollisionBlock, _: BlockPos) -> io::Result<bool> {
+        Ok(false)
+    }
+    fn context_shape(
+        &mut self,
+        _: CollisionBlock,
+        _: BlockPos,
+        _: &CollisionContext<'_>,
+    ) -> io::Result<VoxelShape> {
+        Ok(VoxelShape::empty())
+    }
+}
+
+impl EntityMovementWorld for EmptyCollisions {
+    type Error = io::Error;
+    fn entity_collisions(&mut self, _: EntityIdentity, _: Aabb) -> io::Result<Vec<VoxelShape>> {
+        Ok(Vec::new())
+    }
+    fn movement_border(&mut self, _: EntityIdentity, _: Aabb) -> io::Result<Option<VoxelShape>> {
+        Ok(None)
+    }
+}
+
 /// Collision queries over any block lookup (test worlds without chunks):
 /// every chunk is present, nothing is suffocating, no entities collide.
 pub struct LookupCollisions<'w, 'r> {
@@ -475,3 +544,70 @@ impl PowderSnowWorld for LookupCollisions<'_, '_> {
        Ok(false)
    }
 }
+
+#[cfg(test)]
+mod piston_noclip_tests {
+    use super::*;
+    use horizon_core::geometry::Direction;
+
+    #[test]
+    fn piston_noclip_is_scoped_and_restored_after_unwind() {
+        assert_eq!(PISTON_NOCLIP.with(|value| value.get()), None);
+        with_piston_noclip(Direction::East, || {
+            assert_eq!(
+                PISTON_NOCLIP.with(|value| value.get()),
+                Some(Direction::East)
+            );
+            let _ =
+                std::panic::catch_unwind(|| with_piston_noclip(Direction::West, || panic!("test")));
+            assert_eq!(
+                PISTON_NOCLIP.with(|value| value.get()),
+                Some(Direction::East)
+            );
+        });
+        assert_eq!(PISTON_NOCLIP.with(|value| value.get()), None);
+    }
+}
+
+#[cfg(test)]
+mod border_movement_tests {
+    use super::*;
+
+    /// A border 10 wide around the origin: its wall's inner face is at x = 5.
+    fn border() -> BorderGeometry {
+        BorderGeometry::new([0.0, 0.0], 10.0, 29_999_984).expect("a border")
+    }
+
+    /// `WorldBorder.isInsideCloseToBorder` and `WorldBorder.getCollisionShape`:
+    /// a body inside close to the border collides with the border's walls.
+    #[test]
+    fn a_body_next_to_the_border_stops_at_its_wall() {
+        // A body 0.6 wide, 0.4 blocks short of the wall, moved east into it.
+        let bounds = Aabb::new(Vec3::new(4.0, 0.0, 0.0), Vec3::new(4.6, 1.8, 0.6));
+        let border = border();
+        let mut collisions = EntityCollisions::with_border(EmptyCollisions, &border, [4.3, 0.3]);
+        let moved = collisions
+            .resolve(bounds, Vec3::new(0.51, 0.0, 0.0), 0.0, false)
+            .expect("the movement resolves");
+        // The wall stops the body 0.4 blocks short of the whole move.
+        assert!(
+            (moved.x - 0.4).abs() < 1.0e-9,
+            "the body was not stopped by the border: {moved:?}"
+        );
+    }
+
+    /// Away from the border, the same body moves the whole way.
+    #[test]
+    fn a_body_away_from_the_border_moves_whole() {
+        let bounds = Aabb::new(Vec3::new(0.0, 0.0, 0.0), Vec3::new(0.6, 1.8, 0.6));
+        let border = border();
+        let mut collisions = EntityCollisions::with_border(EmptyCollisions, &border, [0.3, 0.3]);
+        let moved = collisions
+            .resolve(bounds, Vec3::new(0.51, 0.0, 0.0), 0.0, false)
+            .expect("the movement resolves");
+        assert!(
+            (moved.x - 0.51).abs() < 1.0e-9,
+            "the body did not move the whole way: {moved:?}"
+        );
+    }
+}
@@ -1,6 +1,7 @@
 //! `CommandBlockEntity` with its `BaseCommandBlock`: the command, the success
 //! count comparators read, the output it keeps, and the powered, automatic
 //! and condition flags `CommandBlock.tick` runs on.
+pub use crate::chunk::block_entity::CommandBlock;
 use crate::{
    save::{number, text},
    text::Text,
@@ -35,6 +36,23 @@ impl Mode {
            Self::Redstone => "minecraft:command_block",
        }
    }
+    /// `Enum.ordinal`, which `ServerboundSetCommandBlockPacket` writes.
+    pub fn ordinal(self) -> i32 {
+        match self {
+            Self::Sequence => 0,
+            Self::Auto => 1,
+            Self::Redstone => 2,
+        }
+    }
+    /// The mode of a packet's ordinal; `handleSetCommandBlock` treats any
+    /// other value as a plain command block (its `default` branch).
+    pub fn from_ordinal(ordinal: i32) -> Self {
+        match ordinal {
+            0 => Self::Sequence,
+            1 => Self::Auto,
+            _ => Self::Redstone,
+        }
+    }
    /// `CycleButton`: the next value, wrapping round.
    pub fn next(self) -> Self {
        match self {
@@ -59,22 +77,6 @@ pub fn automatic_block(name: &str) -> bool {
    name == "minecraft:chain_command_block"
 }

-#[derive(Clone, Debug, PartialEq)]
-pub struct CommandBlock {
-    pub command: String,
-    pub success_count: i32,
-    /// `CustomName` as saved (a text component).
-    pub custom_name: Option<Tag>,
-    pub track_output: bool,
-    pub last_output: Option<Text>,
-    pub update_last_execution: bool,
-    /// The game time of the last run, -1 for none.
-    pub last_execution: i64,
-    pub powered: bool,
-    pub auto: bool,
-    pub condition_met: bool,
-}
-
 impl Default for CommandBlock {
    fn default() -> Self {
        Self {
@@ -63,13 +63,24 @@ impl Confirm {
        atlas: &HudAtlas,
        cursor: (f32, f32),
        labels: [&Text; 2],
+    ) {
+        self.draw_active(batch, atlas, cursor, labels, true);
+    }
+    /// `draw` with the buttons greyed out while `setDelay` runs (`active` false).
+    pub fn draw_active(
+        &self,
+        batch: &mut HudBatch,
+        atlas: &HudAtlas,
+        cursor: (f32, f32),
+        labels: [&Text; 2],
+        active: bool,
    ) {
        for (line, x, y) in &self.lines {
            batch.text_styled(atlas, line, *x, *y, u32::MAX, true);
        }
        for ((bx, by), label) in self.buttons.into_iter().zip(labels) {
-            let hover = ui::hovered(cursor, bx, by, 150.0, 20.0);
-            ui::button(batch, atlas, bx, by, 150.0, 20.0, label, true, hover);
+            let hover = active && ui::hovered(cursor, bx, by, 150.0, 20.0);
+            ui::button(batch, atlas, bx, by, 150.0, 20.0, label, active, hover);
        }
    }
 }
@@ -124,6 +124,18 @@ impl Clicks {
        self.skip_next_release = true;
    }

+    /// The screen that takes the pointer over starts with its own state:
+    /// `AbstractContainerScreen` holds `isQuickCrafting` and the drag it
+    /// belongs to on the screen, so a screen that opens (or closes) drops
+    /// them. A press whose release never arrived -- the pointer left the
+    /// window -- would otherwise keep the drag running, and `press` answers
+    /// `None` for every later press, so the quick move and the clicks go
+    /// dead on every screen after it.
+    pub fn cancel_drag(&mut self) {
+        self.quick_crafting = None;
+        self.skip_next_release = false;
+    }
+
    /// `mouseClicked` (no double click): the `slotClicked` input it sends on
    /// `target`, if any. A press holding a stack starts a quick craft drag
    /// instead. `cloning` is `keyPickItem` with infinite materials.
@@ -301,4 +313,35 @@ mod tests {
            Some(Input::Pickup)
        );
    }
+
+    /// #1737: a press whose release never arrives (the pointer left the
+    /// window) leaves `isQuickCrafting` set, and `press` answers `None` for
+    /// every later press, so the Shift quick move and the clicks on the
+    /// inventory go dead. The drag belongs to the screen that has it
+    /// (`AbstractContainerScreen` holds `isQuickCrafting`), so the screen
+    /// that takes the pointer over drops it and the quick move works again.
+    #[test]
+    fn a_lost_release_does_not_wedge_the_quick_move() {
+        let mut clicks = Clicks::default();
+        let slot = Target::<usize>::Slot(3);
+        // Pressed with a stack carried: a quick craft drag starts, and its
+        // release never arrives.
+        assert_eq!(clicks.press(&slot, Button::Left, false, false, false), None);
+        assert!(clicks.quick_crafting().is_some());
+        // The stuck drag swallows the next press: the Shift quick move stops
+        // working and the inventory stops answering.
+        assert_eq!(clicks.press(&slot, Button::Right, true, true, false), None);
+        // The screen that takes the pointer over starts with its own state.
+        clicks.cancel_drag();
+        assert!(clicks.quick_crafting().is_none());
+        // The quick move works again.
+        assert_eq!(
+            clicks.press(&slot, Button::Right, true, true, false),
+            Some(Input::QuickMove)
+        );
+        assert_eq!(
+            clicks.press(&slot, Button::Left, true, false, false),
+            Some(Input::Pickup)
+        );
+    }
 }
@@ -1,6 +1,10 @@
 //! Container block entities: chests/barrels (27 slots) and the three furnace
 //! kinds, ticking as `AbstractFurnaceBlockEntity.serverTick` with fuel times
 //! from the data-driven `context_int_provider`/`context_float_provider` files.
+pub use crate::chunk::block_entity::{
+    Banner, Beacon, BlockEntity, Campfire, ChiseledBookshelf, Crafter, CreakingHeart, EndGateway,
+    Furnace, FurnaceKind, Jukebox, Lectern, Skull, SkullSkin,
+};
 use crate::{
    crafting::Recipes,
    items::{ItemStack, Items},
@@ -8,12 +12,6 @@ use crate::{
 use serde_json::Value;
 use std::{collections::HashMap, fs, path::Path, sync::Arc};

-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum FurnaceKind {
-    Furnace,
-    BlastFurnace,
-    Smoker,
-}
 impl FurnaceKind {
    pub fn recipe_type(self) -> &'static str {
        match self {
@@ -34,21 +32,6 @@ impl FurnaceKind {
        }
    }
 }
-#[derive(Clone, Debug)]
-pub struct Furnace {
-    pub kind: FurnaceKind,
-    /// input, fuel, result
-    pub items: [Option<ItemStack>; 3],
-    pub lit_remaining: i32,
-    pub lit_total: i32,
-    pub cooking_timer: i32,
-    pub cooking_total: i32,
-    pub speed: f32,
-    /// `AbstractFurnaceBlockEntity.recipesUsed`: how many of each recipe this furnace has
-    /// made since a player last took from its output. The experience is owed per recipe
-    /// rather than per item, and a save keeps it as the `RecipesUsed` compound.
-    pub recipes_used: HashMap<String, u32>,
-}
 /// The key `recipes_used` keeps a recipe under: its full id, as vanilla's `ResourceKey<Recipe>`
 /// writes it in `RecipesUsed`. Horizon's own recipe ids are file names without the namespace, so
 /// keeping both forms would write a key twice, and vanilla refuses such a furnace
@@ -63,50 +46,6 @@ pub fn recipe_used_key(id: &str) -> String {
 /// A hopper's slots: the only plain container with five.
 pub const HOPPER_SLOTS: usize = 5;

-#[derive(Clone, Debug)]
-pub enum BlockEntity {
-    Chest(Vec<Option<ItemStack>>),
-    Furnace(Furnace),
-    Brewing(Box<crate::brewing::BrewingStand>),
-    /// Signs and hanging signs (`SignBlockEntity`).
-    Sign(crate::signs::SignData),
-    /// `JukeboxBlockEntity`: the record and its `JukeboxSongPlayer`.
-    Jukebox(Jukebox),
-    /// `BeaconBlockEntity`.
-    Beacon(Box<Beacon>),
-    /// `LecternBlockEntity`: the book and the open page.
-    Lectern(Lectern),
-    /// Sculk sensors, shriekers and catalysts (`crate::sculk`).
-    Sculk(Box<crate::sculk::SculkEntity>),
-    /// `CreakingHeartBlockEntity`: its protector and the hurt emitter.
-    CreakingHeart(Box<CreakingHeart>),
-    /// `BannerBlockEntity`: the pattern layers.
-    Banner(Banner),
-    /// `CrafterBlockEntity`.
-    Crafter(Crafter),
-    /// `SpawnerBlockEntity` (`crate::mobs::spawner`).
-    Spawner(Box<crate::mobs::spawner::Spawner>),
-    /// `TrialSpawnerBlockEntity` (`crate::mobs::trial_spawner`).
-    TrialSpawner(Box<crate::mobs::trial_spawner::TrialSpawner>),
-    /// `VaultBlockEntity` (`crate::vault`).
-    Vault(Box<crate::vault::Vault>),
-    /// `BeehiveBlockEntity` of beehives and bee nests (`crate::beehive`).
-    Beehive(Box<crate::beehive::Beehive>),
-    /// `CommandBlockEntity` of the three command blocks (`crate::command_block`).
-    CommandBlock(Box<crate::command_block::CommandBlock>),
-    /// `CampfireBlockEntity` of campfires and soul campfires.
-    Campfire(Box<Campfire>),
-    /// `SkullBlockEntity` of every skull and head block.
-    Skull(Skull),
-}
-/// `CampfireBlockEntity`: four cooking slots, each with its
-/// `cookingProgress` and `cookingTime` (the recipe's).
-#[derive(Clone, Debug, Default, PartialEq)]
-pub struct Campfire {
-    pub items: [Option<ItemStack>; 4],
-    pub progress: [i32; 4],
-    pub total: [i32; 4],
-}
 impl Campfire {
    /// `placeFood`'s slot: the first empty one, given the item's
    /// `campfire_cooking` time; it takes one item of `held`.
@@ -154,17 +93,6 @@ impl Campfire {
        changed
    }
 }
-/// `SkullBlockEntity`: the player profile the head shows (kept as loaded:
-/// a compound, or a string when it names a player only), the note block
-/// sound and `custom_name`.
-#[derive(Clone, Debug, Default)]
-pub struct Skull {
-    pub profile: Option<horizon_world::nbt::Tag>,
-    pub note_block_sound: Option<String>,
-    pub custom_name: Option<horizon_world::nbt::Tag>,
-    /// What `profile` draws, read from it once rather than every frame.
-    pub skin: Option<SkullSkin>,
-}
 impl Skull {
    pub fn new(
        profile: Option<horizon_world::nbt::Tag>,
@@ -180,25 +108,27 @@ impl Skull {
        }
    }
 }
-/// `SkullBlockRenderer.getPlayerSkin` of a head's profile: its skin's URL
-/// with the `skins/<sha1>` sprite it downloads to, and the
-/// `DefaultPlayerSkin` drawn until that sprite is there (steve for a
-/// profile with no id).
-#[derive(Clone, Debug)]
-pub struct SkullSkin {
-    pub download: Option<(String, String)>,
-    pub fallback: &'static str,
-}
 impl SkullSkin {
    pub fn of(profile: &horizon_world::nbt::Tag) -> Self {
        let download = crate::skins::profile_skin_url_nbt(profile).and_then(|url| {
            let location = crate::skins::skin_location(&crate::skins::texture_hash(&url)?);
            Some((url, location))
        });
+        // A `Dynamic` profile (a name or id only) resolves through the
+        // services when the skull is drawn.
+        let dynamic = crate::skins::dynamic_nbt(profile);
        // DefaultPlayerSkin.get(id), or getDefaultSkin (slim steve) without an id.
        let fallback = crate::skins::profile_uuid_nbt(profile)
+            .or_else(|| {
+                crate::skins::nbt_text(profile.get("name"))
+                    .map(|name| horizon_protocol::crypto::offline_uuid(&name))
+            })
            .map_or("entity/player/slim/steve", crate::tab_list::default_skin);
-        Self { download, fallback }
+        Self {
+            download,
+            dynamic,
+            fallback,
+        }
    }
 }
 /// The skull and head blocks (`SkullBlock`, `WallSkullBlock`): every
@@ -206,18 +136,6 @@ impl SkullSkin {
 fn is_skull(name: &str) -> bool {
    name.ends_with("_skull") || (name.ends_with("_head") && name != "minecraft:piston_head")
 }
-/// `CrafterBlockEntity`: nine slots that can be disabled, the powered flag
-/// and the ticks left in the crafting animation.
-#[derive(Clone, Debug, Default)]
-pub struct Crafter {
-    pub items: [Option<ItemStack>; 9],
-    pub disabled: [bool; 9],
-    pub triggered: bool,
-    pub crafting_ticks: i32,
-    /// The block state's `triggered` when last ticked (not saved): the block
-    /// entity flag follows it only when it changes (`CrafterBlock.neighborChanged`).
-    pub state_triggered: Option<bool>,
-}
 impl Crafter {
    /// `slotCanBeDisabled`: only empty slots.
    pub fn slot_can_be_disabled(&self, slot: usize) -> bool {
@@ -257,48 +175,6 @@ impl Crafter {
        })
    }
 }
-#[derive(Clone, Debug, Default)]
-pub struct Banner {
-    pub layers: Vec<crate::banner::BannerLayer>,
-    pub name: Option<String>,
-    /// Components not consumed by BannerBlockEntity's implicit fields.
-    pub components: horizon_world::nbt::Compound,
-}
-/// `CreakingHeartBlockEntity` (the logic is in `game/creaking.rs`).
-#[derive(Clone, Debug, Default)]
-pub struct CreakingHeart {
-    /// The protector: its entity id once resolved, and its UUID (the saved form).
-    pub creaking: Option<(Option<u32>, [i32; 4])>,
-    pub ticks_existed: i64,
-    pub ticker: i32,
-    /// Ticks left of the hurt effect (`emitter`) and where it heads.
-    pub emitter: i32,
-    pub emitter_target: Option<[f64; 3]>,
-    pub output_signal: i32,
-}
-#[derive(Clone, Debug, Default)]
-pub struct Lectern {
-    pub book: Option<ItemStack>,
-    pub page: i32,
-}
-#[derive(Clone, Debug, Default)]
-pub struct Beacon {
-    pub levels: i32,
-    /// Effect ids (`minecraft:speed`).
-    pub primary: Option<String>,
-    pub secondary: Option<String>,
-    /// Beam sections (RGB colour, height) and the ones being rebuilt.
-    pub sections: Vec<(u32, i32)>,
-    pub checking: Vec<(u32, i32)>,
-    pub last_check_y: i32,
-}
-#[derive(Clone, Debug, Default)]
-pub struct Jukebox {
-    pub record: Option<ItemStack>,
-    /// `ticks_since_song_started`, while a song plays.
-    pub ticks: i64,
-    pub playing: bool,
-}
 impl BlockEntity {
    pub fn for_block(name: &str) -> Option<Self> {
        if let Some(hanging) = crate::signs::sign_kind(name) {
@@ -363,6 +239,12 @@ impl BlockEntity {
        if is_skull(name) {
            return Some(Self::Skull(Skull::default()));
        }
+        if name == "minecraft:end_gateway" {
+            return Some(Self::EndGateway(EndGateway::default()));
+        }
+        if name == "minecraft:daylight_detector" {
+            return Some(Self::DaylightDetector);
+        }
        if name == "minecraft:beacon" {
            return Some(Self::Beacon(Box::new(Beacon {
                last_check_y: i32::MIN / 2,
@@ -375,6 +257,9 @@ impl BlockEntity {
        if name == "minecraft:campfire" || name == "minecraft:soul_campfire" {
            return Some(Self::Campfire(Box::default()));
        }
+        if name == "minecraft:chiseled_bookshelf" {
+            return Some(Self::ChiseledBookshelf(Box::default()));
+        }
        let size = match name {
            "minecraft:chest" | "minecraft:trapped_chest" | "minecraft:barrel" => 27,
            n if n.ends_with("copper_chest") => 27,
@@ -412,7 +297,10 @@ impl BlockEntity {
            Self::Beehive(_) => "minecraft:beehive",
            Self::CommandBlock(_) => "minecraft:command_block",
            Self::Skull(_) => "minecraft:skull",
+            Self::EndGateway(_) => "minecraft:end_gateway",
+            Self::DaylightDetector => "minecraft:daylight_detector",
            Self::Campfire(_) => "minecraft:campfire",
+            Self::ChiseledBookshelf(_) => "minecraft:chiseled_bookshelf",
        }
    }
    pub fn contents(&self) -> Vec<ItemStack> {
@@ -429,12 +317,15 @@ impl BlockEntity {
            | Self::Vault(_)
            | Self::Beehive(_)
            | Self::CommandBlock(_)
-            | Self::Skull(_) => Vec::new(),
+            | Self::EndGateway(_)
+            | Self::Skull(_)
+            | Self::DaylightDetector => Vec::new(),
            Self::Lectern(l) => l.book.iter().cloned().collect(),
            Self::Sculk(_) => Vec::new(),
            Self::Banner(_) => Vec::new(),
            Self::Crafter(c) => c.items.iter().flatten().cloned().collect(),
            Self::Campfire(c) => c.items.iter().flatten().cloned().collect(),
+            Self::ChiseledBookshelf(b) => b.items.iter().flatten().cloned().collect(),
        }
    }
    pub fn slots(&self) -> &[Option<ItemStack>] {
@@ -448,8 +339,11 @@ impl BlockEntity {
            | Self::Lectern(_)
            | Self::Sculk(_)
            | Self::Banner(_)
-            | Self::Skull(_) => &[],
+            | Self::EndGateway(_)
+            | Self::Skull(_)
+            | Self::DaylightDetector => &[],
            Self::Crafter(c) => &c.items,
+            Self::ChiseledBookshelf(b) => &b.items,
            Self::CreakingHeart(_)
            | Self::Spawner(_)
            | Self::TrialSpawner(_)
@@ -471,8 +365,11 @@ impl BlockEntity {
            | Self::Lectern(_)
            | Self::Sculk(_)
            | Self::Banner(_)
-            | Self::Skull(_) => &mut [],
+            | Self::EndGateway(_)
+            | Self::Skull(_)
+            | Self::DaylightDetector => &mut [],
            Self::Crafter(c) => &mut c.items,
+            Self::ChiseledBookshelf(b) => &mut b.items,
            Self::CreakingHeart(_)
            | Self::Spawner(_)
            | Self::TrialSpawner(_)
@@ -718,6 +615,18 @@ impl Furnace {
                                    .recipes_used
                                    .entry(recipe_used_key(&recipe.id))
                                    .or_insert(0) += 1;
+                                // AbstractFurnaceBlockEntity.burn: drying a wet sponge fills
+                                // the bucket in the fuel slot.
+                                if self.items[0]
+                                    .as_ref()
+                                    .is_some_and(|i| &*i.item == "minecraft:wet_sponge")
+                                    && self.items[1]
+                                        .as_ref()
+                                        .is_some_and(|f| &*f.item == "minecraft:bucket")
+                                {
+                                    self.items[1] =
+                                        Some(ItemStack::new("minecraft:water_bucket", 1));
+                                }
                                if let Some(i) = self.items[0].as_mut() {
                                    i.count -= 1;
                                    if i.count == 0 {
@@ -105,9 +105,13 @@ impl Report {
    }
 }

-/// The release this binary is (`v0.2.3`); for a release from before 0.2, its tag and the client's
-/// crate version; for a build from source, that version alone.
+/// The release this binary is (`v0.2.3`); a nightly's label (`Nightly 2026-10-28 · 0c02067`); for a
+/// release from before 0.2, its tag and the client's crate version; for a build from source, that
+/// version alone.
 pub fn version() -> String {
+    if let Some(label) = horizon_core::release::nightly_label() {
+        return label;
+    }
    let version = env!("CARGO_PKG_VERSION");
    match (horizon_core::release::RELEASE, release_tag()) {
        (Some(_), Some(tag)) => tag,
@@ -117,8 +121,12 @@ pub fn version() -> String {
 }

 /// The release this binary came with: the version release.yml built in (docs/versioning.md), else
-/// the folder the launcher installed it in, named after the tag (releases from before 0.2).
+/// the folder the launcher installed it in, named after the tag (releases from before 0.2). A
+/// nightly is its version as the launcher installs it (`nightly-2026-10-28-0c02067`).
 pub fn release_tag() -> Option<String> {
+    if let Some(nightly) = horizon_core::release::nightly_version() {
+        return Some(nightly);
+    }
    if let Some(version) = horizon_core::release::RELEASE {
        return Some(format!("v{version}"));
    }
@@ -525,6 +533,11 @@ mod tests {
    #[test]
    fn a_release_reports_its_built_in_version() {
        // release.yml builds with HORIZON_VERSION (docs/versioning.md): `v0.2.3`, wherever it is installed.
+        if let Some(label) = horizon_core::release::nightly_label() {
+            assert_eq!(super::version(), label);
+            assert_eq!(release_tag(), horizon_core::release::nightly_version());
+            return;
+        }
        match horizon_core::release::RELEASE {
            Some(version) => {
                assert_eq!(release_tag(), Some(format!("v{version}")));
@@ -3,7 +3,12 @@
 //! (`creative-inventory.json`), a 9x5 scrolling grid and the search tab.
 use crate::{Result, items::ItemStack, ui::EditBox};
 use serde_json::Value;
-use std::{collections::HashMap, fs, path::Path};
+use std::{
+    collections::HashMap,
+    fs,
+    path::Path,
+    sync::{Arc, Mutex},
+};

 #[derive(Clone, Debug)]
 pub struct Tab {
@@ -40,6 +45,17 @@ pub struct Creative {
    /// The search tab's stacks, in its display order.
    search_items: Vec<ItemStack>,
    search_index: Vec<SearchEntry>,
+    /// ItemPickerMenu.items: what the grid shows, filled when the tab or the
+    /// search changes (selectTab, refreshSearchResults), not on every frame.
+    shown: Mutex<Option<Shown>>,
+}
+/// The grid's stacks for one tab, search text and language.
+struct Shown {
+    tab: usize,
+    search: String,
+    /// A display name, so a language change refills the search results.
+    language: String,
+    items: Arc<[ItemStack]>,
 }
 /// Display names from the pinned en_us language file.
 #[derive(Default)]
@@ -291,6 +307,7 @@ impl Creative {
            },
            search_items,
            search_index,
+            shown: Mutex::new(None),
        }
    }
    /// Where a stack comes in the creative tabs (the search tab lists them
@@ -303,6 +320,22 @@ impl Creative {
            .position(|s| s.same_item_same_components(stack))
            .or_else(|| items.iter().position(|s| s.item == stack.item))
    }
+    /// The tabs without their stacks: what the screen draws of them each frame.
+    pub fn tab_headers(&self) -> Vec<Tab> {
+        self.tabs
+            .iter()
+            .map(|t| Tab {
+                id: t.id.clone(),
+                title: t.title.clone(),
+                icon: t.icon.clone(),
+                items: Vec::new(),
+                top: t.top,
+                column: t.column,
+                search: t.search,
+                inventory: t.inventory,
+            })
+            .collect()
+    }
    pub fn tab(&self) -> &Tab {
        &self.tabs[self.selected.min(self.tabs.len() - 1)]
    }
@@ -384,17 +417,44 @@ impl Creative {
        })
        .collect()
    }
-    /// Items shown by the selected tab (the search tab filters by `search`).
-    pub fn items(&self, names: &Names) -> Vec<ItemStack> {
-        let tab = self.tab();
-        if tab.search {
-            return self
-                .search_results(&self.search.value, names)
+    /// Items shown by the selected tab (the search tab filters by `search`),
+    /// worked out again only when the tab, the search or the language changed.
+    pub fn items(&self, names: &Names) -> Arc<[ItemStack]> {
+        let tab = self.selected.min(self.tabs.len() - 1);
+        let search = if self.tab().search {
+            self.search.value.as_str()
+        } else {
+            ""
+        };
+        let language = names.display_get("itemGroup.search").unwrap_or_default();
+        let mut shown = self.shown.lock().unwrap_or_else(|e| e.into_inner());
+        if let Some(s) = shown.as_ref()
+            && s.tab == tab
+            && s.search == search
+            && s.language == language
+        {
+            return s.items.clone();
+        }
+        let items: Arc<[ItemStack]> = if self.tab().search {
+            self.search_results(search, names)
                .into_iter()
                .map(|i| self.search_items[i].clone())
-                .collect();
-        }
-        tab.items.clone()
+                .collect()
+        } else {
+            self.tab().items.as_slice().into()
+        };
+        *shown = Some(Shown {
+            tab,
+            search: search.to_owned(),
+            language,
+            items: items.clone(),
+        });
+        items
+    }
+    /// Drop the shown items, so the next `items` works them out again: a
+    /// reload can rename items without changing the Search label.
+    pub fn forget_items(&self) {
+        *self.shown.lock().unwrap_or_else(|e| e.into_inner()) = None;
    }
    pub fn rows(&self, names: &Names) -> usize {
        self.items(names).len().div_ceil(9)
@@ -2,7 +2,7 @@
 //! add/update with hidden effects, per-tick application of the periodic
 //! effects (regeneration, poison, wither, hunger, saturation, instant
 //! effects), and the derived flags the movement and damage code read.
-use crate::brewing;
+use horizon_client_core::potions;

 #[derive(Clone, Debug, PartialEq)]
 pub struct EffectInstance {
@@ -129,15 +129,16 @@ fn periodic(id: &str, tick: i32, amp: i32) -> Option<EffectAction> {
        _ => None,
    }
 }
-/// `InstantenousMobEffect.applyInstantenousEffect` (potions apply these directly).
+/// `HealOrHarmMobEffect.applyInstantaneousEffect` (potions apply these directly;
+/// the amount rounds to the nearest whole point).
 pub fn instant(id: &str, amp: i32, scale: f64) -> Option<EffectAction> {
    match id {
        "instant_health" => Some(EffectAction::Heal(
-            (scale * f64::from(4 << amp.min(30))) as i32 as f32,
+            (scale * f64::from(4 << amp.min(30)) + 0.5) as i32 as f32,
        )),
        "instant_damage" => Some(EffectAction::Hurt(
            "minecraft:magic",
-            (scale * f64::from(6 << amp.min(30))) as i32 as f32,
+            (scale * f64::from(6 << amp.min(30)) + 0.5) as i32 as f32,
        )),
        "saturation" => Some(EffectAction::Eat(amp + 1, 1.0)),
        _ => None,
@@ -179,13 +180,14 @@ impl PlayerEffects {
        self.list.clear();
    }
    /// The effects of a saved player (`Player.active_effects`: id,
-    /// duration, amplifier, ambient, visible).
+    /// duration, amplifier, ambient, particles visible).
    pub fn from_saved(saved: &[(String, i32, i32, bool, bool)]) -> Self {
        let mut effects = Self::default();
-        for (id, duration, amplifier, ambient, _) in saved {
-            if let Some(def) = brewing::effect(id) {
+        for (id, duration, amplifier, ambient, particles) in saved {
+            if let Some(def) = potions::effect(id) {
                let mut e = EffectInstance::new(def.id, *duration, *amplifier);
                e.ambient = *ambient;
+                e.visible = *particles;
                effects.add(e);
            }
        }
@@ -213,8 +215,9 @@ impl PlayerEffects {
    }
    /// `LivingEntity.tickEffects` (server part) with the omens' effect ticks:
    /// `omen` answers `BadOmenMobEffect` (every tick) and `RaidOmenMobEffect`
-    /// (on its last tick). Returns the actions to apply, in order, and
-    /// whether Raid Omen was newly added.
+    /// (on its last tick); `absorption_empty` is `AbsorptionMobEffect`'s
+    /// answer: the effect ends once the absorption is used up. Returns the
+    /// actions to apply, in order, and whether Raid Omen was newly added.
    ///
    /// Bad Omen turning into a new Raid Omen adds an entry to the map being
    /// iterated: vanilla's iterator then throws a
@@ -224,6 +227,7 @@ impl PlayerEffects {
    pub fn tick_with(
        &mut self,
        omen: &mut dyn FnMut(&EffectInstance) -> OmenTick,
+        absorption_empty: bool,
    ) -> (Vec<EffectAction>, bool) {
        self.tick_count = self.tick_count.wrapping_add(1);
        let mut actions = Vec::new();
@@ -246,6 +250,7 @@ impl PlayerEffects {
            let answer = match e.id {
                "bad_omen" => omen(e),
                "raid_omen" if t == 1 => omen(e),
+                "absorption" if absorption_empty => OmenTick::Remove,
                _ => OmenTick::Continue,
            };
            match answer {
@@ -302,10 +307,10 @@ impl PlayerEffects {
    ) -> (Vec<EffectInstance>, Vec<EffectAction>) {
        let mut lasting = Vec::new();
        let mut now = Vec::new();
-        if let Some(def) = potion.and_then(brewing::potion) {
+        if let Some(def) = potion.and_then(potions::potion) {
            for (id, duration, amp) in def.effects {
-                let id = brewing::effect(id).map_or("speed", |e| e.id);
-                if brewing::effect(id).is_some_and(|e| e.instant) {
+                let id = potions::effect(id).map_or("speed", |e| e.id);
+                if potions::effect(id).is_some_and(|e| e.instant) {
                    now.extend(instant(id, *amp, 1.0));
                } else {
                    // withScaledDuration: max(floor(d * scale), 1).
@@ -465,13 +470,13 @@ mod tests {
        };
        // The first tick adds Raid Omen and stops there (the iterator's
        // ConcurrentModificationException): Bad Omen and Speed stay as they were.
-        let (_, added) = fx.tick_with(&mut convert);
+        let (_, added) = fx.tick_with(&mut convert, false);
        assert!(added);
        assert_eq!(fx.get("bad_omen").unwrap().duration, 100);
        assert_eq!(fx.get("speed").unwrap().duration, 50);
        assert_eq!(fx.get("raid_omen").unwrap().duration, 600);
        // The second refreshes Raid Omen and drops Bad Omen.
-        let (_, added) = fx.tick_with(&mut convert);
+        let (_, added) = fx.tick_with(&mut convert, false);
        assert!(!added);
        assert!(fx.get("bad_omen").is_none());
        assert_eq!(fx.get("speed").unwrap().duration, 49);
@@ -486,9 +491,9 @@ mod tests {
            seen.push(e.duration);
            OmenTick::Remove
        };
-        fx.tick_with(&mut watch);
+        fx.tick_with(&mut watch, false);
        assert!(fx.get("raid_omen").is_some());
-        fx.tick_with(&mut watch);
+        fx.tick_with(&mut watch, false);
        assert!(fx.get("raid_omen").is_none());
        assert_eq!(seen, vec![1]);
    }
@@ -19,6 +19,8 @@ pub struct ItemEntity {
    pub id: u32,
    pub stack: ItemStack,
    pub thrower: Option<[i32; 4]>,
+    /// `ItemEntity.target`: the only player who may pick the item up.
+    pub target: Option<[i32; 4]>,
    pub position: Vec3,
    pub previous: Vec3,
    pub velocity: Vec3,
@@ -95,6 +97,15 @@ impl ItemEntity {
                self.health -= fire_damage as i32;
            }
        }
+        // CactusBlock.entityInside: `entity.hurt(cactus, 1.0)`. An item has no
+        // hurt cooldown, so it loses 1 health every tick it touches a cactus
+        // (5 health: gone in 5 ticks). Fire resistance does not help;
+        // `ItemStack.canBeHurtBy` only skips it for a damage_resistant stack.
+        if crate::motion::environment::cactus_contact(world, registry, self.bounds())
+            && !items.resists_cactus(&self.stack)
+        {
+            self.health -= 1;
+        }
        ItemEnvironmentTick {
            alive: self.health > 0,
            lava_hurt,
@@ -346,7 +357,10 @@ pub fn merge_with_neighbours(
        }
        // ItemEntity.areMergable: both fit one stack of the same item and components.
        let (this, other) = (&items[i].stack, &items[j].stack);
-        if this.count + other.count > max_stack(other) || !this.same_item_same_components(other) {
+        if items[i].target != items[j].target
+            || this.count + other.count > max_stack(other)
+            || !this.same_item_same_components(other)
+        {
            continue;
        }
        let (to, from) = if other.count < this.count {
@@ -385,8 +399,29 @@ pub struct ExperienceOrb {
    pub value: u32,
    pub age: u32,
    pub on_ground: bool,
+    /// `ExperienceOrb.count`: orbs merged into this one; each pickup gives
+    /// `value` once and takes one off.
+    pub count: u32,
+    /// `Entity.tickCount`, which paces `ExperienceOrb.scanForMerges`.
+    pub ticks: u32,
 }
 impl ExperienceOrb {
+    pub fn bounds(&self) -> Aabb {
+        let h = 0.25;
+        Aabb::new(
+            Vec3::new(self.position.x - h, self.position.y, self.position.z - h),
+            Vec3::new(
+                self.position.x + h,
+                self.position.y + 0.5,
+                self.position.z + h,
+            ),
+        )
+    }
+    /// `ExperienceOrb.canMerge(orb, id, value)` for an orb that is not removed:
+    /// the same value and ids a multiple of 40 apart.
+    pub fn can_merge(&self, id: u32, value: u32) -> bool {
+        self.value == value && (self.id as i32).wrapping_sub(id as i32) % 40 == 0
+    }
    /// ExperienceOrb.getExperienceValue: the largest orb size not above `value`.
    pub fn split(value: u32) -> u32 {
        [2477, 1237, 617, 307, 149, 73, 37, 17, 7, 3, 1]
@@ -416,7 +451,9 @@ impl ExperienceOrb {
        facts: &BlockFacts,
        collision: &BlockCollisionRegistry<'_>,
        player: Option<[f64; 3]>,
+        next_float: &mut dyn FnMut() -> f32,
    ) -> bool {
+        self.ticks += 1;
        self.previous = self.position;
        let block = world.block(
            self.position.x.floor() as i32,
@@ -432,6 +469,14 @@ impl ExperienceOrb {
        } else {
            self.velocity.y -= 0.03;
        }
+        if facts.get(block).fluid == Fluid::Lava {
+            // ExperienceOrb.tick: lava throws the orb back out.
+            self.velocity = Vec3::new(
+                f64::from((next_float() - next_float()) * 0.2),
+                f64::from(0.2f32),
+                f64::from((next_float() - next_float()) * 0.2),
+            );
+        }
        if let Some(p) = player {
            let d = [
                (p[0] - self.position.x) / 8.0,
@@ -449,15 +494,7 @@ impl ExperienceOrb {
                );
            }
        }
-        let h = 0.25;
-        let bounds = Aabb::new(
-            Vec3::new(self.position.x - h, self.position.y, self.position.z - h),
-            Vec3::new(
-                self.position.x + h,
-                self.position.y + 0.5,
-                self.position.z + h,
-            ),
-        );
+        let bounds = self.bounds();
        let mut scene = SceneCollisions {
            world,
            binding: collision,
@@ -494,6 +531,31 @@ impl ExperienceOrb {
        self.age < 6000
    }
 }
+/// `ExperienceOrb.scanForMerges`, run by each orb on `tickCount % 20 == 1`:
+/// it absorbs the orbs that `canMerge` within 0.5 blocks of its box,
+/// adding their counts and keeping the smaller age.
+pub fn merge_orbs(orbs: &mut Vec<ExperienceOrb>) {
+    let mut removed = vec![false; orbs.len()];
+    for i in 0..orbs.len() {
+        if removed[i] || orbs[i].ticks % 20 != 1 {
+            continue;
+        }
+        let area = orbs[i].bounds().inflate(Vec3::new(0.5, 0.5, 0.5));
+        for j in 0..orbs.len() {
+            if j != i
+                && !removed[j]
+                && orbs[j].can_merge(orbs[i].id, orbs[i].value)
+                && orbs[j].bounds().intersects(area)
+            {
+                orbs[i].count += orbs[j].count;
+                orbs[i].age = orbs[i].age.min(orbs[j].age);
+                removed[j] = true;
+            }
+        }
+    }
+    let mut removed = removed.into_iter();
+    orbs.retain(|_| !removed.next().unwrap_or(false));
+}
 /// Player experience (Player.giveExperiencePoints / getXpNeededForNextLevel).
 #[derive(Clone, Copy, Debug, Default)]
 pub struct Experience {
@@ -525,17 +587,21 @@ impl Experience {
            7 + level * 2
        }
    }
-    /// Returns true when a level was gained.
-    pub fn give(&mut self, points: i32) -> bool {
-        let start = self.level;
+    /// Returns the first multiple of 5 the player reached, where each level
+    /// gained would play the level-up sound (`Player.giveExperienceLevels`).
+    pub fn give(&mut self, points: i32) -> Option<i32> {
+        let mut sound_level = None;
        self.progress += points as f32 / Self::needed(self.level) as f32;
        self.total = self.total.saturating_add(points).max(0);
        while self.progress >= 1.0 {
            self.progress = (self.progress - 1.0) * Self::needed(self.level) as f32;
            self.level += 1;
+            if self.level % 5 == 0 {
+                sound_level.get_or_insert(self.level);
+            }
            self.progress /= Self::needed(self.level) as f32;
        }
-        self.level > start
+        sound_level
    }
 }
 /// A painting (`Painting`, a `HangingEntity`): the block it hangs in, the
@@ -710,9 +776,24 @@ pub struct ArmorStand {
    pub name_visible: bool,
    /// Game time of the last hit (the wobble and the second-hit window).
    pub last_hit: i64,
+    /// `DATA_HEAD_POSE` to `DATA_RIGHT_LEG_POSE`: head, body, left arm, right
+    /// arm, left leg, right leg, in degrees (`POSE_KEYS` order).
+    pub pose: [[f32; 3]; 6],
 }
 impl ArmorStand {
    pub const SLOTS: [&'static str; 6] = ["mainhand", "offhand", "feet", "legs", "chest", "head"];
+    /// The `Pose` compound's keys.
+    pub const POSE_KEYS: [&'static str; 6] =
+        ["Head", "Body", "LeftArm", "RightArm", "LeftLeg", "RightLeg"];
+    /// `ArmorStand.DEFAULT_*_POSE`.
+    pub const DEFAULT_POSE: [[f32; 3]; 6] = [
+        [0.0, 0.0, 0.0],
+        [0.0, 0.0, 0.0],
+        [-10.0, 0.0, -10.0],
+        [-15.0, 0.0, 10.0],
+        [-1.0, 0.0, -1.0],
+        [1.0, 0.0, 1.0],
+    ];
    pub fn new(id: u32, position: Vec3, yaw: f32) -> Self {
        Self {
            fire_ticks: 0,
@@ -731,6 +812,7 @@ impl ArmorStand {
            custom_name: None,
            name_visible: false,
            last_hit: i64::MIN / 2,
+            pose: Self::DEFAULT_POSE,
        }
    }
    pub fn environment_tick(
@@ -874,6 +956,7 @@ mod fire_environment_tests {
        let make = |id: &str| ItemEntity {
            id: 1,
            thrower: None,
+            target: None,
            stack: ItemStack {
                item: std::sync::Arc::from(id),
                count: 1,
@@ -970,6 +1053,7 @@ mod merge_tests {
        ItemEntity {
            id: 0,
            thrower: None,
+            target: None,
            stack: ItemStack {
                item: std::sync::Arc::from(id),
                count,
@@ -189,6 +189,7 @@ mod tests {
                extra: None,
            },
            thrower: None,
+            target: None,
            position: at,
            previous: at,
            velocity: Vec3::ZERO,
@@ -14,7 +14,8 @@ struct Globals {
    // Atlas rects (u0, v0, width, height) of end_sky.png and end_portal.png.
    end_portal_sprites: array<vec4<f32>, 2>,
    // x: vanilla's GameTime ((game time % 24000 + partial tick) / 24000)
-    // y: Nether cardinal lighting, z: how many dynamic_lights are set.
+    // y: Nether cardinal lighting, z: how many dynamic_lights are set,
+    // w: the glint scroll clock (`Glint::scroll_ticks`).
    time: vec4<f32>,
    crumbling_sprite: vec4<f32>,
    // Selection outline parameters (read by terrain.wgsl).
@@ -27,6 +28,12 @@ struct Globals {
@group(0) @binding(2) var atlas_sampler: sampler;
@group(0) @binding(3) var lightmap: texture_2d<f32>;
@group(0) @binding(4) var lightmap_sampler: sampler;
+// enchanted_glint_item on its own repeating texture (vanilla's GlintSampler).
+@group(0) @binding(5) var glint_tex: texture_2d<f32>;
+@group(0) @binding(6) var glint_sampler: sampler;
+// The armour layers' GlintSampler: vanilla samples enchanted_glint_armor with
+// the same repeating, linearly filtered sampler as the item glint.
+@group(0) @binding(7) var glint_armor_tex: texture_2d<f32>;
 struct Out {
    @builtin(position) clip: vec4<f32>,
    @location(0) uv: vec2<f32>,
@@ -44,6 +51,11 @@ struct Out {
    // entity.vsh's lightMapColor, multiplied in after the overlay.
    @location(9) light_color: vec4<f32>,
    @location(10) @interpolate(flat) weather_rect: vec4<f32>,
+    // The `GLINT_TEXTURING` sample for overlay 7 (item foil), or the model UV
+    // `ARMOR_ENTITY_GLINT_TEXTURING` scrolls for overlay 13 (armour).
+    @location(11) glint_uv: vec2<f32>,
+    // 1 drops the quad's back-facing pixels (Vertex::normal w = 1), like a culling render type.
+    @location(12) @interpolate(flat) cull: u32,
 }
 // Shipped light.glsl; normals are already transformed and RGBA8_SNORM packed.
 fn entity_light(normal: vec3<f32>, nether: bool) -> f32 {
@@ -92,7 +104,10 @@ fn entity_vertex(position: vec3<f32>, uv: vec2<f32>,
    // minecraft_mix_light: the vertex colour times the cardinal light only.
    var c = color;
    var back = c;
-    if normal.w != 0.0 {
+    // Normal w: 0 keeps the baked colour, +-127 shades by the normal, and a small positive 1
+    // keeps the baked colour but culls back faces (entitySolid models such as the decorated pot).
+    out.cull = select(0u, 1u, normal.w > 0.0 && normal.w < 0.5);
+    if abs(normal.w) >= 0.5 {
        c = vec4(c.rgb * entity_light(normal.xyz, globals.time.y != 0.0), c.a);
        back = select(c, vec4(back.rgb * entity_light(-normal.xyz, globals.time.y != 0.0), back.a), normal.w < 0.0);
    }
@@ -103,18 +118,23 @@ fn entity_vertex(position: vec3<f32>, uv: vec2<f32>,
    out.spherical = select(length(position), 0.0, overlay >= 2u && overlay <= 4u);
    out.cylindrical = select(max(length(position.xz), abs(position.y)), 0.0, overlay >= 2u && overlay <= 4u);
    out.overlay = overlay;
+    out.glint_uv = vec2(0.0);
    if overlay == 4u { out.spherical = length(position); }
    return out;
 }
@vertex fn vs_entity(@location(0) position: vec3<f32>, @location(1) uv: vec2<f32>,
-    @location(2) overlay: u32, @location(3) color: vec4<f32>, @location(4) light: vec4<u32>, @location(5) normal: vec4<f32>) -> Out {
-    return entity_vertex(position, uv, overlay, color, light, normal);
+    @location(2) overlay: u32, @location(3) color: vec4<f32>, @location(4) light: vec4<u32>,
+    @location(5) normal: vec4<f32>, @location(6) glint_uv: vec2<f32>) -> Out {
+    var out = entity_vertex(position, uv, overlay, color, light, normal);
+    out.glint_uv = glint_uv;
+    return out;
 }
 // Retained bolt-local geometry, translated using the same f64 camera
 // subtraction as the former CPU path before adding each local f32 position.
+// The bolt offset is instance attribute 7: 6 is the entity vertex's glint UV.
@vertex fn vs_lightning(@location(0) position: vec3<f32>, @location(1) uv: vec2<f32>,
    @location(2) overlay: u32, @location(3) color: vec4<f32>, @location(4) light: vec4<u32>, @location(5) normal: vec4<f32>,
-    @location(6) offset: vec3<f32>) -> Out {
+    @location(7) offset: vec3<f32>) -> Out {
    return entity_vertex(offset + position, uv, overlay, color, light, normal);
 }
 struct CloudInfo {
@@ -166,12 +186,44 @@ fn linear_fog(d: f32, start: f32, end: f32) -> f32 {
    if d >= end { return 1.0; }
    return (d - start) / (end - start);
 }
+// TextureTransform.setupGlintTexturing(0.16), ARMOR_ENTITY_GLINT_TEXTURING.
+// globals.time.w is (Util.getMillis() * glintSpeed * 8) modulo 330000, the
+// common period of both offsets.
+fn armor_glint_uv(model: vec2<f32>) -> vec2<f32> {
+    let ticks = globals.time.w;
+    let offset0 = (ticks % 110000.0) / 110000.0;
+    let offset1 = (ticks % 30000.0) / 30000.0;
+    let angle = 0.17453292;
+    let c = cos(angle);
+    let s = sin(angle);
+    let scaled = model * 0.16;
+    return vec2(scaled.x * c - scaled.y * s - offset0,
+                scaled.x * s + scaled.y * c + offset1);
+}
+// RenderPipelines.GLINT: the source colour is scaled by itself, so `GlintAlpha`
+// is squared along with the sample.
+fn glint_over(color: vec4<f32>, glint: vec4<f32>) -> vec4<f32> {
+    let alpha = globals.fog_ends.w;
+    let g = alpha * glint;
+    return vec4(color.rgb + g.rgb * g.rgb, max(color.a, alpha));
+}
+// CRUMBLING_UV_BEGIN
+fn crumbling_uv(uv: vec2<f32>, packed_origin: vec2<f32>, sprite_size: vec2<f32>, dimensions: vec2<u32>) -> vec2<f32> {
+    let size = vec2<f32>(dimensions);
+    // Undo stage_light's 16-bit quantization before adding local texels. Otherwise
+    // different stages can fall on opposite sides of a nearest-sampling boundary.
+    let origin = round(packed_origin * size);
+    let extent = max(round(sprite_size * size), vec2(1.0));
+    let local = min(floor(fract(uv) * extent), extent - vec2(1.0));
+    return (origin + local + vec2(0.5)) / size;
+}
+// CRUMBLING_UV_END
@fragment fn fs_entity(in: Out, @builtin(front_facing) front: bool) -> @location(0) vec4<f32> {
    var uv = in.uv;
    if in.overlay == 6u { uv.y = in.wrap.x + fract(in.uv.y) * in.wrap.y; }
    if in.overlay == 11u || in.overlay == 12u {
        // Each crack's stage sprite origin comes in its light bytes (breaking::stage_light).
-        uv = in.wrap + fract(in.uv) * globals.crumbling_sprite.zw;
+        uv = crumbling_uv(in.uv, in.wrap, globals.crumbling_sprite.zw, textureDimensions(atlas));
    }
    var color = textureSample(atlas, atlas_sampler, uv) * select(in.back_color, in.color, front);
    if in.overlay == 9u || in.overlay == 10u {
@@ -187,30 +239,65 @@ fn linear_fog(d: f32, start: f32, end: f32) -> f32 {
        // clouds.fsh: alpha fades out towards the cloud fog end.
        return vec4(color.rgb, color.a * (1.0 - linear_fog(in.spherical, 0.0, globals.fog_ends.y)));
    }
-    if color.a < 0.1 { discard; }
+    if color.a < 0.1 || (in.cull != 0u && !front) { discard; }
    // entity.fsh calculateFinalColor: the overlay (hurt red, TNT white) over the
    // lit texture, then the lightmap, then the glint and fog.
    color = vec4(mix(in.overlay_color.rgb, color.rgb, in.overlay_color.a), color.a);
    color *= in.light_color;
-    if in.overlay == 7u || in.overlay == 8u {
-        // Enchantment glint (overlay 7, 8 with the hurt tint): the purple
-        // enchanted_glint sheen drifting diagonally over the item's shape.
-        let px = in.uv * vec2<f32>(textureDimensions(atlas));
-        let t = globals.misc.y * 0.05;
-        let band = sin((px.x + px.y) * 0.9 - t * 6.0) * 0.5 + 0.5;
-        let band2 = sin((px.x - px.y) * 0.6 + t * 4.0) * 0.5 + 0.5;
-        let shimmer = pow(band * 0.6 + band2 * 0.4, 2.0);
-        let glint = vec3(0.50, 0.25, 0.80) * (0.25 + 0.75 * shimmer);
-        color = vec4(min(color.rgb + glint * 0.6, vec3(1.0)), color.a);
+    if in.overlay == 7u || in.overlay == 8u || in.overlay == 33u {
+        // 33: a translucent item with the glint.
+        // Enchantment glint: item.fsh's GLINT path, sampled from
+        // enchanted_glint_item at the `GLINT_TEXTURING` UV.
+        color = glint_over(color, textureSample(glint_tex, glint_sampler, in.glint_uv));
+    } else if in.overlay == 13u {
+        // Enchanted armour: enchanted_glint_armor at the scrolling model UV.
+        color = glint_over(
+            color,
+            textureSample(glint_armor_tex, glint_sampler, armor_glint_uv(in.glint_uv)),
+        );
    }
    let f = max(linear_fog(in.spherical, globals.fog.x, globals.fog.y),
                linear_fog(in.cylindrical, globals.fog.z, globals.fog.w));
    return vec4(mix(color.rgb, globals.fog_color.rgb, f * globals.fog_color.a), color.a);
 }

+// rendertype_outline.fsh: the vertex colour (the team colour; outline vertices carry no
+// normal, so no cardinal light) wherever the texture is not fully clear.
+@fragment fn fs_outline(in: Out) -> @location(0) vec4<f32> {
+    if textureSample(atlas, atlas_sampler, in.uv).a == 0.0 { discard; }
+    return vec4(in.color.rgb, 1.0);
+}
+
+fn celestial_color(in: Out) -> vec4<f32> {
+    return textureSample(atlas, atlas_sampler, in.uv) * in.color * in.light_color;
+}
@fragment fn fs_celestial(in: Out) -> @location(0) vec4<f32> {
-    let color = textureSample(atlas, atlas_sampler, in.uv) * in.color * in.light_color;
-    return color;
+    return celestial_color(in);
+}
+
+// The sky's celestial pass (sun, moon, the End sky): fs_celestial's light,
+// premultiplied for an additive (one, one) blend, and as alpha how much of it
+// the texel adds, which the blend takes off the frame's alpha. HDR output
+// (hdr.wgsl) lifts only where that left it low: the sun's and moon's discs, not
+// the dark rest of their quads or the dim End sky.
+@fragment fn fs_sky_celestial(in: Out) -> @location(0) vec4<f32> {
+    let color = celestial_color(in);
+    let added = color.rgb * color.a;
+    return vec4(added, smoothstep(0.1, 0.3, max(added.r, max(added.g, added.b))));
+}
+
+// RenderPipelines.ENERGY_SWIRL (entity.fsh with EMISSIVE and NO_OVERLAY): the sprite, scrolled by
+// the UV and repeated within itself, times the layer colour 0xFF808080, unlit; the pipeline adds
+// it to the frame. The light bytes carry the sprite's origin and the colour bytes its size, both
+// as breaking::stage_light packs them.
+@fragment fn fs_energy_swirl(in: Out) -> @location(0) vec4<f32> {
+    let bytes = round(in.color * 255.0);
+    let size = vec2(bytes.x + bytes.y * 256.0, bytes.z + bytes.w * 256.0) / 65535.0;
+    let color = textureSample(atlas, atlas_sampler, crumbling_uv(in.uv, in.wrap, size, textureDimensions(atlas)));
+    if color.a < 0.1 { discard; }
+    let f = max(linear_fog(in.spherical, globals.fog.x, globals.fog.y),
+                linear_fog(in.cylindrical, globals.fog.z, globals.fog.w));
+    return vec4(mix(color.rgb * (128.0 / 255.0), globals.fog_color.rgb, f * globals.fog_color.a), color.a);
 }

 // RenderPipelines.WATER_MASK: depth only (the pipeline masks the colour off).
@@ -186,6 +186,8 @@ mod tests {
            color: u32::MAX,
            light: 0,
            normal: [0; 4],
+
+            glint_uv: [0.0, 0.0],
        };
        let prior = vertex([0.0; 3]);
        let body = [vertex([8.0, -1.0, -1.0]), vertex([10.0, 1.0, 1.0])];
@@ -35,6 +35,18 @@ impl Damage {
            ..Self::default()
        }
    }
+    /// A block that starts to fall: anvils hurt, and a brushable block
+    /// breaks where it lands (BrushableBlock.tick: disableDrop).
+    pub fn falling(block: &str) -> Self {
+        if block.ends_with("anvil") {
+            Self::anvil()
+        } else {
+            Self {
+                cancel_drop: block.starts_with("minecraft:suspicious_"),
+                ..Self::default()
+            }
+        }
+    }
    pub fn from_nbt(tag: &Tag, anvil: bool) -> Self {
        Self {
            hurt_entities: number(tag.get("HurtEntities")).map_or(anvil, |v| v != 0),
@@ -181,6 +193,14 @@ pub fn hurt_mobs(mobs: &mut [Mob], position: Vec3, amount: f32) {
 #[cfg(test)]
 mod tests {
    use super::*;
+    #[test]
+    fn only_brushable_blocks_break_where_they_land() {
+        assert!(Damage::falling("minecraft:suspicious_gravel").cancel_drop);
+        assert!(Damage::falling("minecraft:suspicious_sand").cancel_drop);
+        assert!(!Damage::falling("minecraft:gravel").cancel_drop);
+        assert!(Damage::falling("minecraft:chipped_anvil").hurt_entities);
+    }
+
    #[test]
    fn impact_uses_ceil_distance_capped_damage_and_positive_damage_wear() {
        let damage = Damage::anvil();