- Add directional billboarding for guards: front/side/back idle & walk
frames selected by relative angle to camera, with flipX for left side
- Add shooting pose (always shown when guard is in attack state)
- Add 2-frame walk cycle (300ms) for moving guards (chase/alert/patrol)
- Add death sequence: fall (350ms) → ground (2s) → fade (800ms),
view-only state in WolfensteinView, pooled sprite destroyed on completion
- Wire guard sheet texture from artwork JSON (enemies.png, 9×7 grid,
frames 0-8 used)
- Add E key as alternate interact key for opening doors
- Update door hint text to show [SPACE/E]
- Update sprites.md with full animation/facing/death documentation
