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KRATOS 6df5c2b4cb Improve /resume: interactive session picker + model-generated titles (#224)
* tui: interactive /resume session picker + resume fixes

- /resume (no arg) now opens an interactive picker like /model and /provider:
  one row per resumable session showing the title and session id (+ relative
  age); arrow to highlight, type to filter, enter to load. /resume <id> and
  /resume latest still resolve directly.
- Resume now loads the rehydrated (compaction-aware) event view instead of the
  raw log, so a resumed session honors a prior /compact — matching the CLI's
  `zero exec --resume` and the in-TUI /compact reload. Falls back to raw on a
  rehydrate error.
- The resume summary reports the model/provider the continuation will actually
  use (the active ones), noting the session's recorded model/provider when it
  differs, instead of implying a switch that doesn't happen.
- Drop the dead, self-contradictory resumeText(arg) branch (it was unreachable
  and its hint was circular); resumeText is now the no-session/error fallback.

Tests: session picker opens with title+id rows and hydrates on selection;
resume honors prior compaction (rehydrated, not raw events).

* tui: lead /resume picker rows with a precise timestamp

Same-titled sessions (e.g. the same first prompt run several times) looked like
duplicates because the row showed only the identical title plus a long id that
truncated the age away. Lead each row's label with a precise local timestamp
(HH:MM:SS today, "Jan _2 15:04" earlier this year, else the date) so distinct
sessions are obviously distinct; the full id stays as the right-aligned meta and
is what selection resolves. sessionWhen parses the RFC3339 UpdatedAt.

* tui: hide empty/no-output sessions from the /resume picker

Most of a heavily-retried prompt's sessions are empty failed runs — just the
prompt plus the no-output guardrail stop ("Agent stopped … with no output …"),
with no assistant text and no tool calls. They have nothing to resume and flood
the picker with identical-looking rows. Skip any session with no resumable
content (no tool call/result and no real non-user message) from the picker; they
stay on disk and are never deleted. Adds agent.IsNoProgressStop to recognize the
stop message from a recorded event, and a test that the picker hides an empty
run while keeping a real one.

* feat(tui): model-generated session titles (auto + /retitle backfill)

Sessions were titled from their first user message, so prompts that
started the same way (or empty/failed runs) looked identical in the
/resume picker. Generate a concise, specific title with the active
provider instead.

- sessions.Store.UpdateTitle(id, title): rewrites only Title under the
  per-session lock, re-reading the latest metadata first; leaves
  UpdatedAt untouched (a retitle is not activity and must not reorder
  the resumable list), rejects a blank title, and no-ops an unchanged
  one.
- Title generator: a bounded digest of the conversation (user/assistant
  text + tool names, per-message and total caps, skipping the no-output
  guardrail stop) is sent as a one-shot completion; the response is
  cleaned (first content line, quotes/markup/"Title:" label stripped,
  word- and rune-capped) before storing.
- Auto-title going forward: after a successful turn, a session still
  carrying its default first-message title gets a title in the
  background, at most once per session.
- /retitle: backfills existing resumable sessions that still have a
  first-message title, one at a time, skipping empty/failed runs and
  already-named sessions, with kickoff and completion status lines.

Generation runs off the Update goroutine; failures are non-fatal (the
first-message title simply stays). Adds store + TUI unit tests
(UpdateTitle semantics, digest/cleaning, auto-title one-shot, backfill
candidate selection). gofmt/vet/build(host+linux+windows)/test -race/
staticcheck all green.

* address review: tighten no-progress detection, fix fallback errors + nil guard

Three review findings on the /resume work:

- IsNoProgressStop matched any content CONTAINING the no-output marker
  substring (strings.Contains), so a legitimate assistant/tool message that
  quoted the marker could be misread as a failed empty run — wrongly hiding a
  real session from the /resume picker and skipping its title generation. Now
  it requires the full answer structure (prefix + marker + suffix); a quote no
  longer matches.
- resumeEvents returned the earlier rehydration error when the raw ReadEvents
  fallback itself failed, masking the actual fallback failure. Returns rawErr.
- resumeText dereferenced m.sessionStore unconditionally; a nil store (fallback/
  test paths) would panic. Now renders a safe "store unavailable" message.
  (newSessionPicker already guarded nil.)

Tests: IsNoProgressStop accepts the real answer and rejects a quoting message /
bare marker / prefix- or suffix-only; resumeText with a nil store returns the
safe message instead of panicking. Full gate green.

* address review (Vasanth): structural no-progress check, retryable auto-title, nil-store guard, deep resume assertion

- guardrails: IsNoProgressStop now matches the exact structure noOutputStopAnswer
  emits — prefix + "<int> turns " + marker + " " + suffix — instead of
  prefix && contains(marker) && suffix. A genuine message that merely quotes the
  marker amid other prose is no longer misclassified as a failed empty run (which
  would wrongly hide a real session from /resume and skip its title generation).
  Adds the hostile-input regression cases (quoted marker, text between
  marker/suffix, non-integer turn count).
- session_title: release the optimistic titledSessions gate when a generation
  FAILS (provider error, empty title, store write error) so a later turn or
  /retitle can retry; success keeps the one-shot gate. Kept the optimistic mark
  (rather than mark-on-success) to preserve the no-double-fire guarantee while a
  generation is in flight.
- session_title: guard maybeAutoTitleActiveSession against a nil sessionStore
  (the title cmd calls store.UpdateTitle) — mirrors the resume nil-store guards.
- model_test: assert resumed sessionEvents with reflect.DeepEqual against the
  rehydrated context, not just slice length, so a reordered/substituted-but-
  same-length regression is caught.
2026-06-17 12:41:20 +05:30
..
2026-06-16 20:14:17 +05:30
2026-06-08 21:07:57 +05:30