chore: give every coverage pragma a reason (TS6)

tests/conftest.py

@@ -16,7 +16,7 @@ async def arq_redis() -> typing.AsyncIterator[ArqRedis]:
     pool = await create_pool(settings)
     try:
         await pool.ping()
-    except Exception as exc:  # noqa: BLE001  # pragma: no cover
+    except Exception as exc:  # noqa: BLE001  # pragma: no cover - only when Redis is unreachable; the suite runs against one
         await pool.aclose()
         pytest.skip(f"Redis not available at {REDIS_URL}: {exc}")
     await pool.flushdb()

tests/test_jobs.py

@@ -282,7 +282,7 @@ async def bad_task(
         app_instance: typing.Annotated[AppResource, FromDI(AppResource)],  # noqa: ARG001
         *args: int,
     ) -> None:
-        results["never_called"] = args  # pragma: no cover
+        results["never_called"] = args  # pragma: no cover - never runs; inject rejects the signature first
 
     with pytest.raises(TypeError):
         inject(bad_task)
@@ -294,7 +294,7 @@ async def bad_task(
         app_instance: typing.Annotated[AppResource, FromDI(AppResource)],  # noqa: ARG001
         **kwargs: int,
     ) -> None:
-        results["never_called"] = kwargs  # pragma: no cover
+        results["never_called"] = kwargs  # pragma: no cover - never runs; inject rejects the signature first
 
     with pytest.raises(TypeError):
         inject(bad_task)