Room notice declares scope (train included); first reply accepts a notice
version; terms version for newcomers only; training needs an acceptance at
answer time and a recorded scope; redaction is exit, past use not undone;
salted hash-only tombstone; no reward sound on consent controls; personal
details out of scope; typed field tables for the CultCache records.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>