test(e2e): orchestrator → actuator happy path

### Summary

### Goal
Verify end-to-end message path and telemetry logging.

### Tasks
- Add `tests/e2e/test_happy_path.py`
- Simulate: orchestrator `/ticket` → actuator `/actuate`
- Expect 200 responses
- Verify TelemetryLogger appended event to `logs/YYYY-MM-DD.jsonl`.

### Acceptance
CI passes, log file contains `command_received` and `ack:true`.


### Area

tests

### Priority

high