test: lift coverage 41% → 76% (+1068 tests across 36 files)

Service-level tests now exercise provider, permissions, project, journal,
messaging, work_session, metrics, kanban, extraction, learning, notification,
dashboard, llm_routing, a2a, task, repository_base, audit, db_seed,
branch_name, indexed_document, query_helpers, agent. API route tests cover
provider, journal, project, sessions, dashboard, work_session, tasks, a2a,
groups, notifications, agents, channels, messages, kanban, api_resources.
Pure-function helpers covered: handlers, deps_helpers, middleware,
middleware_docs, transcription, pr templates, agents_config, errors,
logging, journal/notification/channel/a2a access, task_lifecycle,
streaming, converters, crypto, schemas (common + websocket), events,
permissions extras.

pyproject ruff per-file-ignores extended for tests so PLR2004 (status code
magic values), PLC0415 (lazy imports), PLR0913 (fixture params), ARG001
(unused fixture deps), SIM105, and E501 don't fight test idioms.

tests/integration/test_sessions_routes.py

@@ -165,9 +165,7 @@ async def test_create_session(session_client: dict) -> None:
 @pytest.mark.asyncio
 async def test_get_session_not_found(session_client: dict) -> None:
     client = session_client["client"]
-    response = await client.get(
-        f"/api/sessions/{uuid4()}", headers=_HDR
-    )
+    response = await client.get(f"/api/sessions/{uuid4()}", headers=_HDR)
     assert response.status_code == 404
 
 
@@ -191,9 +189,7 @@ async def test_get_session_by_id(
 @pytest.mark.asyncio
 async def test_close_session_not_found(session_client: dict) -> None:
     client = session_client["client"]
-    response = await client.post(
-        f"/api/sessions/{uuid4()}/close", headers=_HDR
-    )
+    response = await client.post(f"/api/sessions/{uuid4()}/close", headers=_HDR)
     assert response.status_code == 404