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fix(#3099): emit LAST_ACTIVITY_UNPARSEABLE diagnostic for unusable last_activity (#3139)

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* fix(#3099): emit LAST_ACTIVITY_UNPARSEABLE diagnostic when last_activity is present but unparseable

parseActivityTimestamp returned null for both absent AND present-but-unusable
last_activity values, silently suppressing the idle-stranded recommendation.
Per ADR-1411's amendment (corrupt is not absent), the fallback stays but a
diagnostic is now emitted via the warnUnusableInput seam.

- Added LAST_ACTIVITY_UNPARSEABLE to UNUSABLE_REASON enum + prose
- Wired warnUnusableInput into detectSignals when lastActivityRaw is truthy
  but parseActivityTimestamp returned null
- Updated UNUSABLE_REASON lock test
- Added 5 regression tests (unusable→diagnostic, absent→silent, well-formed→silent, dedup)

* chore(#3099): add changeset fragment

* chore(#3099): backfill changeset PR number 3139

---------

Co-authored-by: sim <sim@local>
This commit is contained in:
Tom Boucher
2026-08-07 05:32:49 -04:00
committed by GitHub
parent 3146ff36aa
commit 3c1e358a2d
5 changed files with 114 additions and 1 deletions
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---
type: Fixed
pr: 3139
---
**Unusable `last_activity` now emits a diagnostic** — a present-but-unparseable `last_activity` in STATE.md silently suppressed the idle-stranded recommendation. The fallback (`stale_activity: false`) stays for continuity, but a `last_activity_unparseable` warning is now emitted so the degradation is visible. (#3099)