The property walk (seed 468, a CI run's moving seed) found it: when the
build VM went out of reach while _delegate moved the helper's work back
onto the milestone's branch, git's HostUnavailable came back as a
GitError, was noted as a fact, and the driver's run went on, calling the
model with its VM gone (no_model_on_a_lost_vm). Now a GitError caused by a
lost VM raises VMUnreachable once the delegation's intents are settled, so
the run ends and the VM is blocked, as for any other lost-VM call (#137).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk