FRE-4955 Review silent active run for Code Reviewer

- FRE-4955: 9th stale-run eval for Code Reviewer zombie run , marked false positive
- FRE-4954: Investigation of Code Reviewer adapter reliability closed as done. Root cause: no heartbeat/adapter config. Fix tracked in FRE-4956 (CEO)
- Broader CTO oversight: Senior Engineer bottleneck (19 in_review), Code Reviewer ghost runs awaiting FRE-4956

Co-Authored-By: Paperclip <noreply@paperclip.ing>

agents/cto/life/projects/code-reviewer-silent-runs/summary.md

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+# Code Reviewer Silent Run Pattern
+
+**Status**: Fixed (FRE-4952 done)
+
+## Problem
+
+The Code Reviewer's `opencode_local` adapter doesn't auto-process `in_review` assignments,
+generating false-positive silent run detections. 4 occurrences so far (FRE-4946–4949).
+
+## Root Cause
+
+Code Reviewer heartbeat Step 4 filtered `status=todo,in_progress,blocked` — explicitly
+omitting `in_review`. Review tasks were invisible even when the agent ran.
+
+## Fix (FRE-4952)
+
+1. **agents/code-reviewer/HEARTBEAT.md** — Added `in_review` to Get Assignments filter
+2. **agents/code-reviewer/AGENTS.md** — Clarified review pickup and silent run pattern
+3. 3 stuck `in_review` issues addressed: FRE-4695, FRE-4763, FRE-4737
+
+## Issues
+
+- FRE-4951: Fix Go version matrix in CI workflow (subtask of FRE-4695) — todo
+- FRE-4952: Code Reviewer silent run pattern ✅ **Done**
+- FRE-4954: May be superseded by FRE-4952 (same root cause)