Preview a non-executing External Source Scaffold activation-plan suite

Compiles a non-executing owner-gated activation-plan suite for all five External Source Scaffold Program workstreams. The response exposes readiness status, approval blockers, required smoke evidence, docs/API/OpenAPI/public-discovery sync requirements, rollback paths, and next implementation actions while keeping activation execution disabled. This preview writes no records and cannot launch 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.