cli: drop snapshot/restore in favor of fork as the CoW primitive#15
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Removes the user-facing `ember snapshot {create,restore,list,delete}`
commands along with the corresponding StorageBackend trait methods,
backend impls (ZFS, dm-thin, APFS), the SnapshotEntry/SnapshotInfo
types, and the VmMetadata.snapshots field. Internal `@base` and
`fork-<name>` snapshots used by image cloning and fork stay in place.
The "checkpoint before risky change → roll back" workflow becomes
"fork before the change → delete the bad VM". Fork already exercises
the same CoW machinery on every backend, so this is a strict
simplification.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Removes the user-facing
ember snapshot {create,restore,list,delete}commands along with the corresponding StorageBackend trait methods, backend impls (ZFS, dm-thin, APFS), the SnapshotEntry/SnapshotInfo types, and the VmMetadata.snapshots field. Internal@baseandfork-<name>snapshots used by image cloning and fork stay in place.The "checkpoint before risky change → roll back" workflow becomes "fork before the change → delete the bad VM". Fork already exercises the same CoW machinery on every backend, so this is a strict simplification.