Tokens/codes/secrets were already digests; a stolen cleartext SQLite file
still leaked the agent roster, revocation state and audit history.
SealedStore / SIGIL_SEAL_PASS wraps on-disk bytes in AES-256-GCM
(PBKDF2-HMAC-SHA256, 480k iters). Working copy is plaintext only while
open (temp file); flush/close re-seals. Incremental path short of
SQLCipher page-level encryption.
11 new tests in test_sealed.py (stolen seal has no SQLite header / no
agent rows; wrong passphrase fails; works with off-box anchor). Suite
130 green.
Part of Quarry 18a5d762. Independent crypto review + platform glue remain.
73f802a5e6