Validation caught that Docker 29's default containerd-snapshotter keeps the
image store at /var/lib/containerd (on the rootfs), so mounting the data volume
at /var/lib/docker only moved named volumes — images (1.2G) stayed on the
rootfs, defeating the split. overlay2 stores images+overlay+volumes under
data-root = the data volume, which the split and the controller's statfs(/)
guard both require. Golden daemon.json now sets features.containerd-snapshotter
false + a driver guard.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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