Migrations

Apply graph-wide status migrations, rewriting legacy lifecycle values to the current spec.

migrate_status

Apply `UPG_STATUS_MIGRATIONS` graph-wide: rewrite legacy lifecycle status values to canonical phase ids. Auto-mode (no filters) selects nodes whose current status is invalid against the entity type's lifecycle and has a registered replacement (the same invariant that drives `validate_graph` lifecycle_drift). Surgical mode (`from_status` + `to_status`) overrides the registry and rewrites every (entity_type?, from_status) match. Nodes with invalid statuses but no registered replacement surface under `skipped_no_migration`. Default `dry_run=true`; pass `dry_run=false` to commit.

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