优化浏览器context复用

tests/test_warm_context.py

@@ -111,6 +111,23 @@ async def test_warm_context_rebuilds_and_closes_on_failure():
     assert sess2.session_id != sess1.session_id   # 换了新会话
 
 
+@pytest.mark.asyncio
+async def test_expired_warm_context_is_closed_on_rebuild():
+    pool = _FakeBrowserPool()
+    # 存活时长设为 0：任何已存在的保活上下文都立即判定过期
+    settings = Settings(session_ttl_seconds=0, cloudflare_reuse_wait_timeout_seconds=8.0)
+    mgr = CloudflareSessionManager(settings, pool, SessionStore(settings))
+
+    await mgr.fetch_html(_DETAIL_URL.format(1))
+    assert pool.create_calls == 1
+
+    # 第二次请求：旧上下文过期 -> 退役关闭 -> 重建，旧上下文不应泄漏
+    await mgr.fetch_html(_DETAIL_URL.format(2))
+    assert pool.create_calls == 2
+    assert pool.contexts[0].closed is True
+    assert len(mgr._warm_contexts) == 1  # 注册表中只保留新的那个
+
+
 @pytest.mark.asyncio
 async def test_close_releases_all_warm_contexts():
     pool = _FakeBrowserPool()