- Each stack gets its own Vault Transit key (transit/keys/sops-state-<stack>)
- state-sync passes per-stack Transit URI + age keys on encrypt
- Vault policies scope namespace-owners to their stacks only:
- sops-admin: wildcard access to all transit keys
- sops-user-<name>: access only to owned stack keys
- Anca (plotting-book) can only decrypt plotting-book state
- Admin can decrypt everything (via admin Transit policy or age fallback)
- External group sops-plotting-book maps Authentik group to Vault policy
- Updated CLAUDE.md with state sync documentation