The production composition hardwired the macOS Keychain (/usr/bin/security),
which made Linux deployment impossible. Now:
- SecretStore gains a stable provider identity persisted in
secret_references.provider; services stop hardcoding 'macos-keychain'
- shared reference codec (secret-reference.ts) understands both
keychain:// and secret-file:// references
- FileSecretStore: single 0600 JSON map under the data root, atomic
temp+rename writes, serialized in-process, same validation envelope
- production composition picks the backend via
MULTI_SIMADMIN_SECRET_BACKEND (default: Keychain on darwin, file store
elsewhere) and readiness probes the matching backend
chick
e4c4bce75b