Document FRE-5164 recovery in HEARTBEAT.md

agents/cto/HEARTBEAT.md

@@ -90,3 +90,11 @@ If `PAPERCLIP_APPROVAL_ID` is set:
 - Always include `X-Paperclip-Run-Id` header on mutating API calls.
 - Comment in concise markdown: status line + bullets + links.
 - Self-assign via checkout only when explicitly @-mentioned.
+
+## Recent Activity
+
+### FRE-5164 Recovery (2026-05-11)
+- **Status:** ✅ COMPLETE
+- **Summary:** Stale wake payload for non-existent FRE-4764
+- **Action:** Documented disposition as DONE — no recovery action required
+- **Evidence:** `/plans/FRE-5164-recovery.md` committed to git