Venues: persistent room, motivated camera, ride; drop Pylon Grid

- Venue as one continuous place: persistent per-song layer, interpolated
  venueState, story jumps (one re-hang max + recap) with camera cuts
- Room camera shot plan (venueShots.js): per-section size/target, monotonic
  look sweep, traverse glide body, room-side alternation
- New Ride venue: generated vehicle + actor passengers, radio RTT screen,
  chase/stationary modes, ride archetype across generator/camera/staging
- Flora cost trim (5x(12+6+6) -> 4x(8+4+4) SDF evals, 204ms -> 140ms worst)
- Delete Pylon Grid shader (2.5s/frame SwiftShader); drop its metadata row
- tools/venue-check.js headless gate harness + venue-gallery explorer

flow-state/src/checks/filmstrip.js

@@ -69,11 +69,12 @@ function blockMean(byBlock) {
  *
  * @returns {{name, frames: Array, drift: number, direction: number, look}}
  */
-export function renderSong(show, name, { duration, every }) {
+export function renderSong(show, name, { duration, every, venueEnabled = null }) {
     const { track } = song(name, { duration });
     // Seeded off the song's name, so a strip is stable between rebuilds and two
     // songs are not accidentally handed the same look.
-    const look = generateLook(track, { seed: hashString(name) });
+    const venueFlag = venueEnabled !== null ? !!venueEnabled : (typeof location !== 'undefined' && new URLSearchParams(location.search).get('venue') === '1');
+    const look = generateLook(track, { seed: hashString(name), venueEnabled: venueFlag });
     show.useTrack(track, look);
 
     const frames = [];
@@ -162,6 +163,7 @@ export function renderSong(show, name, { duration, every }) {
     return {
         name,
         frames,
+        look,
         drift: mean(dists),
         direction: directionOf(gaps, dists),
         // Agitation over the strip: worst 1 s floating window, max(flash/3,
@@ -205,7 +207,7 @@ function momentAt(story, index) {
  * times for nothing.
  */
 export async function buildFilmstrip({
-    duration = DEFAULT_DURATION, every = DEFAULT_EVERY, names = null,
+    duration = DEFAULT_DURATION, every = DEFAULT_EVERY, names = null, venueEnabled = null,
     onSong = null, onSongStart = null,
 } = {}) {
     const list = names && names.length ? names : songNames();
@@ -223,9 +225,9 @@ export async function buildFilmstrip({
             }
             let row;
             try {
-                row = renderSong(show, list[i], { duration, every });
+                row = renderSong(show, list[i], { duration, every, venueEnabled });
             } catch (err) {
-                row = { name: list[i], frames: [], drift: 0, direction: 0, error: err.message };
+                row = { name: list[i], frames: [], shots: [], drift: 0, direction: 0, error: err.message };
             }
             rows.push(row);
             if (onSong) onSong(i + 1, list.length, row);