Docker-backed servers lose a startup race against OrbStack at login and are marked Failed ~15s in, because a missing docker socket burns the crash-retry budget. Measured: OrbStack takes 18s to create its socket; the retry cap trips at 15s. Adds a per-server wait-for precondition (path / tcp / command) that gates the spawn without consuming the retry budget, surfaces as a new Waiting state, and stays interruptible by stop/shutdown. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EGntTHCW3sEPy1VBRopNNp