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_mcp.py

@@ -52,7 +52,9 @@ class _FakeDriver(Driver):
     ) -> None:
         return None
 
-    def swipe_path(self, waypoints: list[tuple[float, float]], duration_ms: int) -> None:
+    def swipe_path(
+        self, waypoints: list[tuple[float, float]], duration_ms: int
+    ) -> None:
         return None
 
     def double_tap(self, x: float, y: float, interval_ms: int = 80) -> None:
@@ -307,4 +309,4 @@ def test_wrapped_tool_accepts_context_kwarg() -> None:
     tool_manager = server._tool_manager  # type: ignore[attr-defined]
     tool = tool_manager.get_tool("take_screenshot")
     assert tool is not None
-    assert tool.context_kwarg == "ctx"
+    assert tool.context_kwarg == "ctx"