AgentInbox v1.6.0

[1.6.0] - 2026-09-05

Changed

• Startup database handling is event-driven instead of unconditional (#237):
  regular opens verify the database with PRAGMA quick_check (escalating to a
  full integrity_check only when the quick pass fails) and no longer rewrite
  a full backup on every startup.
• A full backup is now taken automatically only before pending schema
  migrations run, named <db>.pre-migrate-v<N>.bak and bounded by
  AGENTINBOX_MIGRATION_BACKUP_KEEP (default 5; 0 keeps all) (#237).
• AGENTINBOX_STARTUP_BACKUP now defaults to off; setting it to 1 restores
  the legacy v1.5.2 behavior of an unconditional backup plus a full
  integrity_check on every open (#237).
• Status diagnostics now report quickCheck instead of running a full
  integrity_check on every status call (#237).

Added

• agentinbox backup writes a verified <db>.bak snapshot on demand for
  scheduled or pre-upgrade snapshots; recovery considers manual and
  pre-migration backups, most recent first (#237).

Fixed

• Corrected the v1.5.2 release notes claim that "an existing healthy backup
  is reused instead of being rewritten": that behavior was not implemented in
  v1.5.2 and startup backups were rewritten on every open. The event-driven
  model above replaces it (#237).