Venues: song sky, ride roadside, room camera, filmstrip venue pin

- Shared sky dome (src/venues/sky.js): gradient backdrop from palette /
  section light / style texture, wired into chamber/stage/ride with fog
  matched to the dome mid colour — replaces clear-to-black
- Ride roadside: houses, signs, trees, seeded viz billboard, all analytic
  scroll; popMul fade for crew, arrangement-gated roadside (no mid-section
  popping); parked idle creep + engine shake; analytic dash clock
- Room camera: traverse glide + progress look sweep + per-section dolly,
  single-side room visits, one re-hang max; venue framing per archetype
- Filmstrip venue selector (?venueSel=) with cache key; seed persisted to
  URL on reroll; gallery query plumbing

flow-state/venue-gallery.html

@@ -66,8 +66,8 @@ import { scenes } from '/src/scenes/registry.js';
 import { blit } from '/src/checks/blit.js';
 
 const THUMB = { width: 320, height: 180 };
-const DEFAULT_ROWS = 5;
-const DEFAULT_COLS = 5;
+const DEFAULT_ROWS = 3;
+const DEFAULT_COLS = 3;
 const ROW_OPTIONS = [2, 3, 4, 5, 6, 8, 10];
 const COL_OPTIONS = [1, 2, 3, 4, 5, 6, 8];