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GET /disks emits guest_boot_id = <host-btime>-<guest-init-starttime>: changes on every guest/host boot, stable across controller-only restarts. The controller persists it + deterministically recreates drive-backed apps on change (replaces the timed state-sample). Non-hollow parser test + companion. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>