Fleet Runner v0.8.8

Reliability: the runner can no longer go silently offline after the dashboard restarts (e.g. during a deploy).

The wait=0 command poll had no request timeout, so a connection left half-open by a backend restart could hang the poll forever — the poller went silent, the process stayed alive (so nothing restarted it), and the autopilot loop stalled. The poll is now bounded with a 20s timeout; on timeout it backs off and retries instead of hanging. Pairs with running the runner under a supervised service (auto-restart) for end-to-end 'never silently offline'.