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bos upgrade --from v1 — audit an everything-dev v1 child app for upgrade readiness (mount conformance gate, config surface, legacy imports) and apply the deterministic v2 transforms (authored descriptor, bun→pnpm catalog migration, consumerized refs, import rewrites, obsolete-file deletion, plugin dep declarations). State-aware post-upgrade behavior plus re-runnable maintenance steps (port-route-guards, db-topology, i18n-seam, compose-seam). Use when upgrading a v1 child to the v2 train, auditing upgrade readiness, or re-running post-upgrade regression guards after bos sync.