Fix CI: Add missing aiofiles dependency

Dependencies issue was causing all CI tests to fail with ImportError.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jeremymanning

pyproject.toml

@@ -27,6 +27,7 @@ dependencies = [
     "pydantic>=2.0.0",
     "pyyaml>=6.0",
     "aiohttp>=3.8.0",
+    "aiofiles>=23.0.0",
     "asyncio-mqtt>=0.13.0",
     "jinja2>=3.0.0",
     "jsonschema>=4.0.0",