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>

tests/ingestor/test_websocket.py

@@ -223,7 +223,9 @@ class TestTradeStreamHandler:
 
     @pytest.mark.asyncio
     async def test_connect_sends_subscription(
-        self, handler: TradeStreamHandler, _on_state_change_mock: AsyncMock
+        self,
+        handler: TradeStreamHandler,
+        on_state_change_mock: AsyncMock,  # noqa: ARG002
     ) -> None:
         """Test that connection sends subscription message."""
         mock_ws = AsyncMock()