Account disconnect/delete needs to remove the per-user YouTube refresh
token from the SecretStore. Add Delete(ref) on the file-backed store,
mirroring Put: atomic temp-file+rename, 0600, no-op on an absent ref.
Kept off the read-only ports.SecretStore (Get) — write/delete follow the
existing auth.TokenWriter convention of narrow capability interfaces, so
the youtube adapter's read-only dependency is unaffected.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
mathiasandClaude Opus 4.8
17d5e8c393