Problem: CI test "updateJSON serializes writes across separate node processes"
was failing with expect 100 but got 89/97. The root cause was isLockStale()
being too aggressive - it could mistakenly delete locks held by other processes.
Fixes:
1. isLockStale() now uses mtime only - fresh locks are never stale
2. Added heartbeat mechanism during lock hold to support long updaters
3. Removed PID check that was unreliable in CI/containers
4. Fixed ENOENT race when lock is released between EEXIST and stat
Tests: 180 pass, 0 fail
## Task 1: Fix exitCode undefined false positive
- Add `typeof exitCode !== "number"` check in plugin.ts
- Only extract errors when exitCode is explicitly non-zero
- Prevent git-log/cat with "errors" text from creating false positives
## Task 2: Fix workspace memory XML truncation
- Budget-aware line-by-line rendering
- Always include closing </workspace_memory> tag
- Return empty string when budget too small
- Bonus: canonical exact deduplication with source priority
## Task 3: Remove "always" as trigger
- Replace "always" with "going forward" in patterns
- Add word boundary via `g` flag and matchAll loop
- "from now on" still works as expected
## Task 4: Verification
- 22 tests passing
- typecheck passing
Tests cover:
- git log/cat with loose "errors" ignored
- TS2345/TypeError strong signals captured
- undefined exitCode: no create, no clear
- exitCode 0: clears errors
- exitCode non-zero: creates error
- XML never truncated mid-tag
- "always" not a trigger
Ralph Chang