Use when the user wants to apply (deploy) a ConfigHub Unit or group of Units to their Target — phrases like "apply this", "deploy this to staging", "push the change to the cluster", "roll out the fix", "apply everything that's unapplied", "apply the ChangeSet", "dry-run what would change". Runs `cub unit apply` with the right scoping (single / list / --where / --filter / --revision ChangeSet:<slug>), respects ApplyGates (never bypasses), waits for completion, and hands off to verify-apply. Do not load for rollback (use rollback-revision — `cub unit apply --revision <N>` does NOT move head and is not a rollback), for authoring changes (use cub-mutate), for binding a destination (use target-bind), or for any post-apply verification / troubleshooting / close-out (use verify-apply).