=== BL3: SHA 불일치 stale review → BLOCK ===
Timestamp: 2026-05-05T17:52:54Z
Scenario: review 1건이지만 commit_id가 head_sha와 불일치 (force-push로 stale)

{
  "state": "block",
  "reason": "all evidence stale (SHA mismatch)",
  "evidence": {
    "primary": [
      {
        "type": "review",
        "id": 1,
        "body_snippet": "LGTM, looks good",
        "commit_sha": "old-sha-before-force-push",
        "stale": true,
        "severity_matches": []
      }
    ],
    "secondary": [],
    "high_severity_hits": [],
    "supplementary_signals": []
  },
  "head_pushed_at": "2026-05-05T17:52:44.095377Z",
  "elapsed_seconds": 10,
  "timeout_seconds": 300
}