Tom Boucher 3c1e358a2d fix(#3099): emit LAST_ACTIVITY_UNPARSEABLE diagnostic for unusable last_activity (#3139) ...

* 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

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Co-authored-by: sim <sim@local>

2026-08-07 05:32:49 -04:00

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