feat: modeled market stalls, mega wall ads, traffic lights, awnings

Final detail pass — no gameplay object remains a plain box:

- Markets: box stalls replaced with modeled kit stalls (4 styles seeded),
  hidden box colliders keep the wood acoustics; hand carts at the market
  mouths; standing lanterns between stalls
- Shrines: hanging lanterns on the stone pillars, wooden fences flanking
  the torii approach
- Towers: giant mid-height wall ads on the street faces (the anime-city
  mega-ad look), on top of crown boards and corner columns
- Storefront awnings (kit detail piece) on ~40% of buildings
- Traffic signals at every central-avenue crossing, diagonal from the
  streetlights
- Fantasy Town Kit (CC0) installed at assets/props/town

Verified via street capture (wall-scale glyph ads, pharmacy signs,
banner ads, stalls, carts); movement 11/11, smoke 0, acoustics PASSED.

Co-Authored-By: Claude Fable 5 <[email protected]>

assets/props/town/LICENSE.txt

@@ -0,0 +1,28 @@
+	
+
+	Fantasy Town Kit (2.0)
+
+	Created/distributed by Kenney (www.kenney.nl)
+	Creation date: 03-08-2025 13:56
+	
+			------------------------------
+
+	License: (Creative Commons Zero, CC0)
+	http://creativecommons.org/publicdomain/zero/1.0/
+
+	You can use this content for personal, educational, and commercial purposes.
+
+	Support by crediting 'Kenney' or 'www.kenney.nl' (this is not a requirement)
+
+			------------------------------
+
+	• Website : www.kenney.nl
+	• Donate  : www.kenney.nl/donate
+
+	• Patreon : patreon.com/kenney
+	
+	Follow on social media for updates:
+
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