- secret_backends.py: SecretBackend protocol, FileSecretBackend (historical),
OpenBaoBackend (KV-v2 read + file fallback), build_backend() env-selected
- _read_secret delegates to the active backend; default is file, so production
is unchanged until CASTLE_SECRET_BACKEND=openbao
- OpenBao token bootstraps from the file backend; missing/unreachable falls back
- tests: file hit/miss, backend selection, unreachable + empty-token fallback
Read path verified live against castle-openbao. Write path, auto-unseal-on-boot,
and TLS hardening documented as remaining for full OpenBao production use.
- add static 'role' (authority|follower) to NodeConfig/CastleConfig, wired from
castle.yaml through the registry to the mesh wire; civil pinned authority
- castle-presence: TTL KV bucket each node renews (churn signal); delete-on-stop
- castle-config: authority-gated get/put + change-watch SSE (follower reconcile
hook hangs off it)
- bound the NATS drain on stop() so shutdown can't hang
- tests: role config/registry round-trip, wire round-trip, role write-gating
Single-node verified; follower reconcile pending the second node.
Phased plan to evolve the mesh into a purpose-driven fleet: NATS (JetStream KV +
presence) replacing Mosquitto, OpenBao as the secret authority, cross-node
requires resolution + gateway circuit-breaker, static civil=authority role.
Records resolved decisions and Phase 0/1 progress.
