Preview a non-executing External Source Scaffold release-candidate suite

Compiles a non-executing owner-gated release-candidate suite from production-audit packets or nested production-audit inputs plus owner-supplied implementation PR, production smoke, rollback acceptance, docs/discovery sync, and owner release-review evidence refs. The response exposes per-workstream release-review checklists, blockers, production audit status, rollback paths, and next actions while keeping PR creation/merge, owner release approval recording, 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.