fix: write-ahead audit entry so calls stop when the audit log stops accepting writes (SEC-03)

tests/test_server.py

@@ -476,6 +476,9 @@ async def test_audit_write_failure_after_execution_does_not_break_the_call(
     httpx_mock.add_response(url=f"{API}/repos/octo/demo", json={})
 
     class BrokenAudit:
+        def log_tool_call_started(self, *args: Any, **kwargs: Any) -> str:
+            return "started"
+
         def log_tool_invocation(self, *args: Any, **kwargs: Any) -> str:
             raise OSError("disk full: " + GITEA_TOKEN)