style: ruff format after MCP server integration

Reformat the files touched by Tasks 1-14 of the host-agent MCP server
plan. No semantic changes; pre-existing format issues in unrelated
files (test_templates, test_skill_sync_wiring, 0010_skill_management,
test_skill_catalog_mcp) left untouched for a separate housekeeping
pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/device-host-agent/tests/test_web_app.py

@@ -833,9 +833,7 @@ def _seed_local_task(
     source_task_id: str | None = "cloud-task-1",
 ) -> str:
     task = Task(goal="open settings", device_id="dev-1", status=status)
-    metadata_store.create_task(
-        task, source_task_id=source_task_id, source_attempt=1
-    )
+    metadata_store.create_task(task, source_task_id=source_task_id, source_attempt=1)
     return task.id