perf: move blocking homepage and hash I/O off loop

Co-authored-by: Copilot App <[email protected]>

tests/test_app.py

@@ -65,6 +65,7 @@ class TestAppLifespan:
             openrouter_api_key="test-key",
             environment="test",
             bootstrap_schema_on_startup=True,
+            worker_poll_interval_seconds=2.5,
             upload_dir=tmp_path / "uploads",
             prompt_dir=tmp_path / "prompts",
         )
@@ -80,6 +81,7 @@ class TestAppLifespan:
         assert "worker_start" in calls
         assert "worker_stop" in calls
         assert "dispose_db" in calls
+        assert worker_kwargs["poll_interval_seconds"] == pytest.approx(settings.worker_poll_interval_seconds)
         assert worker_kwargs["shutdown_timeout_seconds"] == pytest.approx(
             settings.worker_provider_timeout_seconds + settings.worker_shutdown_grace_seconds
         )

tests/test_config.py

@@ -170,6 +170,7 @@ class TestWorkerReliabilitySettings:
         assert settings.worker_stale_job_seconds == 30.0
         assert settings.worker_retry_backoff_seconds == 1.0
         assert settings.worker_shutdown_grace_seconds == 5.0
+        assert settings.worker_poll_interval_seconds == 1.0
 
 
 def test_provider_timeout_is_not_capped_at_twenty_seconds():

tests/test_meta_contract_guards.py

@@ -170,6 +170,7 @@ def test_env_example_default_values_match_settings_defaults():
         "WORKER_STALE_JOB_SECONDS": str(defaults.worker_stale_job_seconds),
         "WORKER_RETRY_BACKOFF_SECONDS": str(defaults.worker_retry_backoff_seconds),
         "WORKER_SHUTDOWN_GRACE_SECONDS": str(defaults.worker_shutdown_grace_seconds),
+        "WORKER_POLL_INTERVAL_SECONDS": str(defaults.worker_poll_interval_seconds),
         "WORKER_MIN_TRANSCRIPTION_CHARS": str(defaults.worker_min_transcription_chars),
         "WORKER_MIN_TRANSCRIPTION_LINES": str(defaults.worker_min_transcription_lines),
         "WORKER_FAIL_ON_FINISH_REASON_LENGTH": str(defaults.worker_fail_on_finish_reason_length).lower(),