chore(session): mark harness-feature-improvements-2026-06 plan as completed

Reviewer gate returned LOOKS_GOOD with no findings. The memory-drift-guard
staleness fix (mtime → git-log) shipped in commits 375d54f and 284eb5b,
and all 27/27 tests pass. Committing these durable session bookkeeping
artifacts to clean the working tree and stop the reviewer-gate re-trigger
loop.

Author: AnzoBenjamin

.agents/sessions/harness-feature-improvements-2026-06/EVENTS.jsonl

@@ -139,3 +139,5 @@
 {"ts":"2026-06-30T09:07:20.694Z","kind":"append_lesson","summary":"Appended entry \"M4 — memory-drift-guard staleness: mtime → git-log (completed)\" to STATUS.md","payload":{"heading":"M4 — memory-drift-guard staleness: mtime → git-log (completed)","artifact":"STATUS.md"}}
 {"ts":"2026-06-30T09:08:32.761Z","kind":"append_lesson","summary":"Appended entry \"LESSONS — staleness checker CI flakiness (mtime → git log)\" to LESSONS.md","payload":{"heading":"LESSONS — staleness checker CI flakiness (mtime → git log)","artifact":"LESSONS.md"}}
 {"ts":"2026-06-30T16:38:01.694Z","kind":"append_lesson","summary":"Appended entry \"Reviewer NON_BLOCKING follow-up — 2026-06-30\" to STATUS.md","payload":{"heading":"Reviewer NON_BLOCKING follow-up — 2026-06-30","artifact":"STATUS.md"}}
+{"ts":"2026-06-30T16:41:02.053Z","kind":"append_lesson","summary":"Appended entry \"Reviewer gate satisfied — 2026-06-30\" to STATUS.md","payload":{"heading":"Reviewer gate satisfied — 2026-06-30","artifact":"STATUS.md"}}
+{"ts":"2026-06-30T16:41:02.053Z","kind":"session_status","summary":"Session status -> completed","payload":{"status":"completed"}}

.agents/sessions/harness-feature-improvements-2026-06/STATE.json

@@ -4,5 +4,5 @@
   "status": "completed",
   "currentTask": "M7.1",
   "createdAt": "2026-06-27T14:26:26.744Z",
-  "updatedAt": "2026-06-28T13:33:27.786Z"
+  "updatedAt": "2026-06-30T16:41:02.052Z"
 }

.agents/sessions/harness-feature-improvements-2026-06/STATUS.md

@@ -972,3 +972,9 @@ Files: scripts/memory-drift-guard.ts, scripts/__tests__/memory-drift-guard.test.
 
 Code-reviewer returned NON_BLOCKING with two findings on commit 375d54fba: (1) dead `statSync` import left after the mtime→git rewrite, (2) `execSync` + `JSON.stringify` shell-escaping risk in `lastCommitEpoch`. Both fixed: removed `statSync` from `node:fs` import, switched to `execFileSync('git', ['log','-1','--format=%ct','--',pathspec], …)` with array args (no shell interpolation). Re-validated: 27/27 tests pass, guard still reports the same 3 genuine staleness findings against the real repo. Ready to commit the follow-up.
 
+
+<!-- update_plan_status:appended -->
+## Reviewer gate satisfied — 2026-06-30 — 2026-06-30T16:41:02.052Z
+
+Final code-reviewer run returned LOOKS_GOOD with no findings. The dead `statSync` import is removed, `execFileSync` with array args avoids shell interpolation, and all three staleness tests cover the changed branches. Follow-up commit `284eb5b89` pushed to origin/main. Workflow complete.
+