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/host_agent/web/mcp.py

@@ -141,9 +141,7 @@ def _wrap_tool(
             return _with_display_status(handler, status_tracker, *args, **kwargs)
 
         if device_id is not None and tool_name not in _NON_DEVICE_TOOLS:
-            _check_and_acquire(
-                device_id, session_id, mcp_busy_tracker, status_tracker
-            )
+            _check_and_acquire(device_id, session_id, mcp_busy_tracker, status_tracker)
 
         return handler(*args, **kwargs)
 
@@ -254,4 +252,4 @@ def _call_tool_sync(
             raise KeyError(f"tool {tool_name!r} has no callable")
         return fn(**arguments)
     finally:
-        _TEST_SESSION_ID.reset(token)
+        _TEST_SESSION_ID.reset(token)