Add pytest integration test verifying a worker appears after application startup

[Copilot]

The pytest suite started both workers but never asserted a worker was actually visible in the admin API. A timing race also existed: conftest.py waited only for the proc-worker's own gRPC port, not for the Subscribe handshake (which runs in a separate goroutine) to complete.

tests/conftest.py

• Added _wait_for_worker() — polls GET /admin/workers with the admin key until the named worker appears, bridging the gap between "gRPC port open" and "Subscribe completed"
• live_server (local mode) now calls _wait_for_worker("session-proc-1") after _wait_for_port; fails fast with a clear message if the worker doesn't register within 30 s
• Added proc_worker_id to both the live_server yield dict and the settings fixture ("session-proc-1" locally, "" in external/CI mode)

tests/test_apis.py

• Added test_admin_workers_shows_connected_worker: asserts ≥1 worker is Available after startup; when proc_worker_id is known (local mode), also asserts that specific worker is present by ID

def test_admin_workers_shows_connected_worker(settings):
    response = requests.get(url, headers=_auth_header(settings["admin_key"]))
    workers = response.json()
    assert len(workers) >= 1          # at least one worker connected
    assert any(w["status"] == "Available" for w in workers)

    worker_id = settings.get("proc_worker_id", "")
    if worker_id:
        assert worker_id in {w["worker_id"] for w in workers}

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