Classify heartbeat lease failures

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02b6f-7db1-7222-918b-e813a6bda38d

tests/test_ops_run_client.py

@@ -137,6 +137,16 @@ def test_claim_http_error() -> None:
             client.claim()
 
 
+def test_ops_run_error_classifies_lease_rejection_without_message_details() -> None:
+    rejected = OpsRunError("provider response included credentials", status_code=409)
+    transient = OpsRunError("connection reset")
+
+    assert rejected.lease_rejected is True
+    assert rejected.status_code == 409
+    assert transient.lease_rejected is False
+    assert transient.status_code is None
+
+
 def test_ops_run_to_taskspec(tmp_path: Path) -> None:
     import subprocess