feat: validate real-bench seat orchestration and self-repair

tests/unit/test_self_repair.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import json
+import time
 from pathlib import Path
 
 from cognitive_agent.application.self_repair.healing_model import (
@@ -81,3 +83,24 @@ def test_bridge_manager_does_not_arm_visible_tooling_by_default(tmp_path: Path)
     assert snapshot["state"] == "IDLE"
     assert snapshot["retry_armed"] is False
     assert snapshot["attempts"] == 0
+
+
+def test_bridge_manager_does_not_restart_a_live_busy_request(tmp_path: Path) -> None:
+    status_path = tmp_path / "bridge.json"
+    status_path.write_text(
+        json.dumps({
+            "heartbeat_epoch": time.time() - 5.0,
+            "bridge_state": "RUNNING",
+            "current_request_id": "SELF_HEAL_BENCH_1",
+        }),
+        encoding="utf-8",
+    )
+    manager = ZcanBridgeManager(
+        status_path,
+        tmp_path / "bridge.py",
+        heartbeat_stale_s=3.0,
+        busy_heartbeat_grace_s=45.0,
+    )
+
+    assert manager._heartbeat_online() is False
+    assert manager._bridge_busy_within_grace() is True