chore(tests): make ruff happy after head_wobbler removal

Drop three imports that became unused once the head_wobbler-only test
cases were removed (numpy and pytest in tests/test_console.py, base64
in tests/test_openai_realtime.py). Re-collapse a wrapped lambda in
tests/test_gemini_live.py back onto one line per ruff format.

Pure tooling fix; no behaviour change. CI ruff check now passes.

Author: RemiFabre

tests/test_console.py

@@ -5,8 +5,6 @@
 from types import SimpleNamespace
 from unittest.mock import AsyncMock, MagicMock
 
-import numpy as np
-import pytest
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 

tests/test_gemini_live.py

@@ -147,9 +147,7 @@ async def test_gemini_turn_buffers_transcripts(monkeypatch) -> None:
     handler.client = _FakeLiveClient(session)
 
     task = asyncio.create_task(handler._run_live_session())
-    await _wait_for(
-        lambda: handler.output_queue.qsize() >= 3 and movement_manager.set_listening.call_count >= 2
-    )
+    await _wait_for(lambda: handler.output_queue.qsize() >= 3 and movement_manager.set_listening.call_count >= 2)
 
     handler._stop_event.set()
     await asyncio.wait_for(task, timeout=1.0)

tests/test_openai_realtime.py

@@ -1,4 +1,3 @@
-import base64
 import random
 import asyncio
 import logging