bug: circuit-breaker integration test still counts the old operator-queue call for the dormant alert (stale since #3246) #3343

Summary

tests/integration/test_circuit_breaker.py::TestDormantState::test_dormant_transition_emits_operator_queue_alert fails on dev. #3246 part 1 (#3255) moved the circuit breaker's dormant alarm onto the platform-alerts seam (services/platform_alerts.py), so services/agent_client/circuit.py now files it through db.create_platform_operator_queue_item. The test still counts the old call:

assert fake_db.create_operator_queue_item.call_count == 1
AssertionError: assert 0 == 1

The alert itself still fires. The captured log shows the circuit_breaker_dormant entry created through create_platform_operator_queue_item. Only the test is out of date.

Context

• Found by /verify-local's integration stage while verifying Gated skills: close the seven #3208 validation gaps before the gate map makes them reachable #3274. It fails identically on the untouched base (dev at a51549772), with the integration Redis environment set.
• Integration tests don't run in the per-PR CI jobs, which is why this went unnoticed when fix(operator-queue): platform alerts are conditions — one pending row per subject (#3246, part 1) #3255 merged.
• The test also logs a non-fatal [platform-alerts] could not schedule a follow-up warning (spawn_on_loop called from a thread with no running loop). That comes from driving record_failure() synchronously outside an event loop, and is worth checking while the test is updated.

Acceptance Criteria

• The test asserts the platform-alert path: one create_platform_operator_queue_item call (or the platform-alerts subject for the dormant kind) on the closed/open → dormant transition.
• It still proves the alert fires exactly once, and not again on a later failure while the circuit stays dormant.
• The test passes against a running integration Redis (/verify-local integration stage, or pytest tests/integration/test_circuit_breaker.py).

Technical Notes

• Breaking change: f73d0c0a9 (fix(operator-queue): platform alerts are conditions — one pending row per subject (#3246, part 1) #3255).
• Files: tests/integration/test_circuit_breaker.py, src/backend/services/agent_client/circuit.py, src/backend/services/platform_alerts.py.