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_kanban_routes.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 from typing import TYPE_CHECKING
-from uuid import uuid4
 
 import pytest
 import pytest_asyncio
@@ -86,7 +85,5 @@ async def test_get_kanban_stats(kanban_client: AsyncClient) -> None:
 
 @pytest.mark.asyncio
 async def test_get_dev_board_with_swimlane(kanban_client: AsyncClient) -> None:
-    response = await kanban_client.get(
-        "/api/kanban/dev/backend?swimlane_by=priority"
-    )
+    response = await kanban_client.get("/api/kanban/dev/backend?swimlane_by=priority")
     assert response.status_code == 200