fix: correct test fixture names and add aiosqlite dependency

- Revert underscore-prefixed fixture parameters (breaks pytest discovery)
- Use # noqa: ARG002 comments instead
- Add aiosqlite to dev dependencies for SQLite-based tests

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -28,6 +28,7 @@ dev = [
     "ruff>=0.1.0",
     "mypy>=1.7.0",
     "pre-commit>=3.0.0",
+    "aiosqlite>=0.19.0",
 ]
 
 [build-system]