Preview a non-executing External Source Scaffold release-execution-preflight suite

Compiles a non-executing owner-gated release-execution-preflight suite from approved release-decision packets or nested release-decision inputs plus owner-supplied release executor approval, operator, release window, production smoke command, rollback execution, post-release observation, final docs/public-discovery diff, and incident contact refs. The response exposes per-workstream preflight checklists, blockers, release-decision status, and next actions while keeping release execution start, release decision execution, release executor dispatch, PR merge, owner release approval by helper, production release, production smoke execution, and docs/public discovery mutation disabled. This preview writes no records and cannot execute implementation, run production smoke, release production, publish public discovery, mutate routes, mutate Seller OS, mutate trust/ranking, activate or mutate x402, move wallets, settle, dispatch providers, run browser automation, write or promote memory, perform live finance actions, or expose private Full ECF payloads.