Two changes, both test-only:
- Configure the aiohttp session with TCPConnector(force_close=True) and an
explicit ClientTimeout(total=30, connect=10). Prevents reuse of idle TCP
connections that the proxy/kernel may have closed during the long window
between setup POSTs and the later poll loop, and surfaces a blocked proxy
event loop quickly instead of hanging on aiohttp's 5-minute default.
- In poll_key_spend_until, catch aiohttp.ClientError and asyncio.TimeoutError
around the single /key/info call. A transient transport hiccup now logs and
retries on the next tick instead of failing the entire polling loop.
Addresses the ConnectionTimeoutError observed on the first /key/info call
after the 20 chat completions.