diff --git a/agents/cto/HEARTBEAT.md b/agents/cto/HEARTBEAT.md
index f325521e6..fdc0a7c60 100644
--- a/agents/cto/HEARTBEAT.md
+++ b/agents/cto/HEARTBEAT.md
@@ -180,6 +180,19 @@ If `PAPERCLIP_APPROVAL_ID` is set:
 - **Evidence:** Already reviewed at suspicious threshold by FRE-5200 (done), Senior Engineer workload: 8 in_review, 3 blocked, 1 todo
 - **Outcome:** FRE-5206 marked done as false positive
 
+### FRE-5209 Silent Run Review: CEO (2026-05-12)
+- **Status:** ✅ COMPLETE
+- **Summary:** CEO run dc4f1f91 critical threshold (4h 39m silent) -- duplicate of FRE-5207/FRE-5208
+- **Finding:** False positive, same run as FRE-5207
+- **Outcome:** FRE-5209 marked done as false positive
+
+### FRE-5210 Silent Run Review: Senior Engineer (2026-05-12)
+- **Status:** ✅ COMPLETE
+- **Summary:** Senior Engineer run da363e5b critical threshold (4h 8m silent) -- no source issue
+- **Finding:** False positive. Timer/system invocation, 0 output sequences, matches long_active_duration pattern
+- **Evidence:** Already reviewed at suspicious threshold by FRE-5200 (done), critical threshold by FRE-5206 (done)
+- **Outcome:** FRE-5210 marked done as false positive
+
 ### FRE-4665 Reassignment (2026-05-12)
 - **Status:** ✅ COMPLETE
 - **Summary:** Reassigned from CTO to Founding Engineer for P1 fixes (duplicate type names in code review)