Path-scoped collection storage (items/<slug>/<id>.enc) for hook-enforceable
writes; signature-verifying pre-receive hook on every commit; audit actor from
verified signer (trailers advisory + TAMPERED flag); org item CRUD in scope;
rotate-key re-encrypts all items; transfer/delete-org; extension parity in
phase 1; living-docs impact section.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>