v1.15.6

• Faster, smarter auto-lock: BLEUnlock now reacts to the trajectory of the signal, not just its level. When you walk away and the signal falls off and drops out, the Mac locks within a few seconds instead of waiting the full no-signal timeout; a brief Bluetooth dropout while you are present still waits a short grace period. Unlocking is unchanged. (Active-mode connections only; passive-scan monitoring keeps the configured timeout.)