KeyStoneMastery

## [1.9.1] - 2026-04-30

### Fixed

- Deferred bootstrap `ADDON_LOADED`/`PLAYER_LOGIN` event binding out of the main chunk and added guarded retry scheduling, reducing `Frame:RegisterEvent()` forbidden-call captures in taint-heavy 12.0.5 sessions.

- Hardened chat keystone-link parsing with a fail-closed readability gate and protected execution path so secret/unreadable payloads cannot trigger string-operation faults.

- Added extra fail-closed protection around chat keystone-link ingestion and command extraction so parsing failures no longer propagate through chat event handling.

- Unified chat payload readability validation through a reusable guarded string-access helper that checks readable string access before normalization/parsing work.