Add classic HUD, auto reload, furniture pathfinding and death flatline

docs/OFFICE-ATMOSPHERE.md

@@ -3,8 +3,8 @@
 `scripts/office_atmosphere.gd` adds two desks, three chairs and a metal fire barrel.
 Props use low-poly primitives with simple static collisions on world layer 1.
 Positions avoid the four cardinal entry corridors and the central combat space.
-The zombies still use their existing direct pursuit, not a new pathfinding system;
-props can obstruct arbitrary paths when the player hides behind them.
+Zombies now route around furniture using the shared XZ grid described in
+`GAMEPLAY-IMPROVEMENTS.md`; static collision bounds feed the navigation map.
 
 The central ceiling OmniLight was removed. Ambient energy is 0.12 with a cool blue
 color, preserving silhouette readability rather than total darkness. Two warm desk
@@ -40,4 +40,4 @@ Three screenshots `/tmp/zombie-office-{0,1,2}.png` inspected, including the barr
 All seven prior suites pass: health/sky, music, grenade, waves, death, damage, touch.
 Existing resource-in-use warnings at test shutdown remain. Actual smartphone
 performance has not been measured; this is a small light/particle budget, not an
-FPS guarantee. Keep testing arbitrary zombie routes around the new obstacles.
+FPS guarantee. Physical furniture-pursuit tests are in `test_gameplay_improvements.gd`.