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feat(fleet): add reviewed v1-to-v2 migration preview
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-15 22:04:51 -05:00

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# Fleet Control-Plane CLI
The local roster-v2 control plane is `mosaic fleet`.
```text
mosaic fleet apply --expected-generation <n> [--dry-run]
mosaic fleet reconcile --expected-generation <n> [--dry-run]
mosaic fleet start [name] --expected-generation <n> [--dry-run]
mosaic fleet stop [name] --expected-generation <n> [--dry-run]
mosaic fleet restart [name] --expected-generation <n> [--dry-run]
mosaic fleet status [name]
mosaic fleet verify
mosaic fleet doctor
mosaic fleet migrate-v1 preview --source <path> --decisions <path> --observations <path>
```
`migrate-v1 preview` is non-mutating: it emits value-free v1 inventory, a canonical semantically
validated v2 candidate when ready, sanitized environment dispositions, and non-executable recovery
evidence. It has no write, apply, canary, or rollback option. Missing preview inputs also return one stable
blocked JSON object and a non-zero exit, rather than Commander text. See
[the migration preview contract](../migration/v1-to-v2.md).
`apply` and `reconcile` use roster desired state. `start`, `stop`, and `restart` are exact local one-shot lifecycle effects and never persist a desired-state edit. `status`, `verify`, and `doctor` are observational.
Commands emit one JSON object. Handled precondition errors emit `{ "error": { "code": "..." } }` and exit non-zero. Partial derived/lifecycle effects use explicit `authoritativeRoster`, `projections`, `lifecycle`, and bounded `recovery` fields; they never claim rollback. Any additive `cleanup` diagnostic also exits non-zero, even where known effects are complete: it is not a clean completion and the lock requires inspection before retry.
This control plane is separate from the gateway-backed `mosaic agent` catalog. It is local-only and rejects remote/connector lifecycle mutation, arbitrary command/channel/secret input, and unproven tmux ownership.