Add office furniture and dim fire-lit horror atmosphere

docs/OFFICE-ATMOSPHERE.md

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+# Office horror atmosphere
+
+`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.
+
+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
+lamps use short-range unshadowed OmniLights. The barrel is the only persistent
+shadow-casting light (range10, energy1.9–2.8), with smooth bounded sine-based flicker.
+The existing muzzle flash is unchanged: four omni lights total.
+
+Fire uses 28 CPUParticles3D and small unshaded additive billboard quads. A generated
+64x96 alpha flame mask is in assets/effects/flame.png. No glow, volumetric fog, GI,
+GPU particles or Forward+-only effects are required. No fire damage was added.
+The flame mesh does not cast shadows. The barrel and furniture do.
+
+References consulted (Perplexity unavailable; official docs via Exa):
+- https://docs.godotengine.org/en/stable/tutorials/3d/lights_and_shadows.html
+- https://docs.godotengine.org/en/stable/classes/class_omnilight3d.html
+- https://docs.godotengine.org/en/stable/classes/class_cpuparticles3d.html
+
+Compatibility defaults to eight omni lights per mesh. Shadows are expensive and
+can change light brightness because Compatibility uses a different shadowed-light
+rendering path; visual checks were therefore done with gl_compatibility.
+
+Verification (installed Godot4.7.1):
+
+```sh
+"$G" --headless --path . --script res://tools/test_office_atmosphere.gd
+"$G" --display-driver x11 --rendering-method gl_compatibility --path . \
+  --script res://tools/test_office_atmosphere.gd -- --screenshot
+```
+
+Checks: prop counts/collisions, bounded flicker, CPU emitter, light count, absent
+ceiling light, low ambient, free cardinal ray corridors and desk collision.
+Three screenshots `/tmp/zombie-office-{0,1,2}.png` inspected, including the barrel.
+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.

docs/WEB-DEPLOY.md

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 # Web build and compressed deployment
 
+## Office atmosphere release: fd65770c62e811fe
+
+See `docs/OFFICE-ATMOSPHERE.md`: two desks, three chairs, two desk lamps and
+CPU-particle fire barrel; ceiling light removed, low cool ambient.
+PCK 3,946,516 bytes; gzip payload total 12,402,612 bytes. Previous releases retained.
+Root backup: `index-before-office.html`. Serial import workaround applied to staging.
+
+
 ## Health + starry sky release: 31564f79b9f5e299
 
 See `docs/HEALTH-SKY.md`: +1 HP/second while alive, capped at 100; Half-Life