fix(pet): one whale body — reconcile the cores and make conformance pass

`portable` (Pet conformance) has never passed. It did not regress at
`a06d2296`; that is only when the workflow started running. The failure goes
back to `334c720057`, whose message claims "380 matching checkpoints across
v1/v2, with pinned v1 digests unchanged" — a gate that was not true of the
content it committed. `pet_sim.rs` is byte-identical at that commit and at
HEAD, the v1 fixtures were created there and never changed, and Rust has never
matched them.

The cause is not the simulation. `field_target` is line-for-line identical
between `pet_sim.rs` and `pet/src/core/pet-sim.ts` — every channel, every
constant — and both mulberry32 implementations agree (Rust's `u32`
`wrapping_*` is exactly `Math.imul`/`>>>`). The tape's label sequence matched
byte-for-byte all along: the two cores agreed on what the pet was doing and
disagreed on where its particles were, from frame 0.

The authored body is checked in **five** times:

    pet/whale-points.tsv                            f54c19a76021
    pet/dist/whale-points.tsv                       f54c19a76021
    pet/rs/whale-points.tsv                         f54c19a76021
    pet/public/whale-points.tsv                     f54c19a76021
    crates/tui/src/tui/ambient_life/whale-points.tsv   9e56d5280d9b

Four agree; the Rust product core — the one the TUI actually renders — was the
lone dissenter, with a different derivation of the same 980-point shape. No
sync step produces these files, so the existing `git diff --exit-code` guard on
embedded sources could never see the drift.

Rust is canonical (founder's call), so the four pet copies are synced to it and
the v1 fixtures are regenerated from the Rust binary. That makes verify.sh's
fixture check an assertion that TypeScript matches the Rust-derived contract,
rather than TypeScript agreeing with itself.

A CI step now compares the copies directly, because nothing else can: this is
five hand-maintained copies of one fact, and the drift was invisible for days.
Folding them into one generated artifact is the real fix and is left as
follow-up.

Checks: `./pet/verify.sh --no-swift` exits 0 — 380 checkpoints across 2
expression versions and 4 tapes/modes, all eight combinations PASS, up from a
hard failure on the first v1 diff. `npm --prefix pet run check` — 68 pass, 0
fail. `npm --prefix pet run sync` leaves `git diff --exit-code` on the embedded
sources clean.

Refs #6227

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01NWzjx9Q7Mw2G7K8rpiJy9p

.github/workflows/pet.yml

@@ -35,6 +35,19 @@ jobs:
       - run: npm --prefix pet run sync
       - name: Embedded sources match canonical core
         run: git diff --exit-code -- crates/tui/src/tui/pet_watch/pet-native.js pet/ios/Resources
+      # The authored body is checked in five times and nothing kept the copies
+      # in step, so the Rust core silently carried a different whale from every
+      # other surface and conformance never passed. Compare them directly: no
+      # sync step produces these, so `git diff` cannot catch the drift.
+      - name: One whale body across every surface
+        run: |
+          canonical=crates/tui/src/tui/ambient_life/whale-points.tsv
+          for copy in pet/whale-points.tsv pet/public/whale-points.tsv pet/rs/whale-points.tsv; do
+            diff -q "$canonical" "$copy" || {
+              echo "::error file=$copy::diverged from $canonical; the Rust core is canonical"
+              exit 1
+            }
+          done
       - run: cargo fetch --locked --manifest-path pet/tui/Cargo.toml
       - name: TypeScript and Rust parity, including reduced motion
         run: ./pet/verify.sh --no-swift

pet/tests/fixtures/v1-baseline-animated.txt

@@ -1,68 +1,68 @@
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pet/tests/fixtures/v1-baseline-reduced-motion.txt

@@ -1,68 +1,68 @@
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pet/tests/fixtures/v1-edge-cases-animated.txt

@@ -1,27 +1,27 @@
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pet/tests/fixtures/v1-edge-cases-reduced-motion.txt

@@ -1,27 +1,27 @@
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