Audit prop budgets and add a prop-gallery art check

- audit_glb decodes geometry: 400 tris / 600 verts budget, degenerate
  triangles, UV range, ground contact, one material; newspaper box parts moved
  to sit on y=0
- capture_prop_gallery.gd renders the six props on a studio backdrop; new
  prop_gallery catalogue entry + AI mockup (compare 10 good, judge match 0.90)
- headless test that instances share the imported atlas material
- README documents the gallery capture and budget; TODO props pipeline section
  moved to DONE

README.md

@@ -14,9 +14,9 @@ The central design goal is simple:
 | ![Access inspection: wristband/credential check with allow/deny prompt](docs/screenshots/03-access-inspection.png) | ![Radio report form: emergency dispatch panel](docs/screenshots/04-radio-report.png) |
 | ![Late night: street lamps lit, marquee glowing, dark Hollywood Boulevard](docs/screenshots/05-late-night-avenue.png) | ![Night shift: guard flashlight cutting through the dark](docs/screenshots/06-night-flashlight.png) |
 | ![Wand screening at The Joke Shop: false alarm on keys](docs/screenshots/07-wand-screening.png) | ![Escalation HUD at L3 with body camera armed and reaction log](docs/screenshots/08-escalation-hud.png) |
-| ![Body-camera timeline: formal warning, body camera on, blocking](docs/screenshots/09-body-camera-timeline.png) | |
+| ![Body-camera timeline: formal warning, body camera on, blocking](docs/screenshots/09-body-camera-timeline.png) | ![Prop gallery: the six generated street-furniture models on a studio backdrop](docs/screenshots/10-prop-gallery.png) |
 
-*Screenshots are generated by [`src/test/capture_screenshots.gd`](src/test/capture_screenshots.gd) from the current build — day, late-night, wand screening, escalation, and shift-review timeline.*
+*Screenshots are generated by [`src/test/capture_screenshots.gd`](src/test/capture_screenshots.gd) and [`src/test/capture_prop_gallery.gd`](src/test/capture_prop_gallery.gd) from the current build — day, late-night, wand screening, escalation, shift-review timeline, and the prop lineup.*
 
 ## ⬇️ Downloads
 
@@ -248,6 +248,9 @@ python3 tools/screen_designs.py generate --draft --only wand --force
 # (requires OPENROUTER_API_KEY)
 python3 tools/screen_designs.py generate
 
+# Prop gallery (studio line-up) for close-range prop checks
+godot --path . --script res://src/test/capture_prop_gallery.gd
+
 # Compare docs/screenshots/*.png against the designs
 python3 tools/screen_designs.py compare
 python3 tools/screen_designs.py compare --json