fix(ai): improve docker repair verification signals

apps/api/tests/test_learning_chain_e2e.py

@@ -225,10 +225,13 @@ async def test_auto_repair_success_triggers_verify_and_learn(monkeypatch):
     assert len(stub_verifier.calls) == 1, "verifier.verify() 應被呼叫一次"
     assert stub_verifier.calls[0]["incident_id"] == incident.incident_id
     assert stub_verifier.calls[0]["snapshot"] is None
+    assert stub_verifier.calls[0]["action_taken"].startswith(f"auto_repair:{playbook.playbook_id}")
+    assert "steps=Step 1:" in stub_verifier.calls[0]["action_taken"]
 
     assert len(stub_learning.verification_calls) == 1, "record_verification_result 應被呼叫一次"
     call = stub_learning.verification_calls[0]
     assert call["incident_id"] == incident.incident_id
+    assert call["action_taken"] == stub_verifier.calls[0]["action_taken"]
     assert call["verification_result"] == "success"
     assert call["matched_playbook_id"] == playbook.playbook_id