Polish movement hall interiors: clear doors and bay columns, tone floors and windows.

Document hang keep-outs and period-module fixes; leave columns fixed while packing frames into gaps.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/__tests__/floor-brightness.test.js

@@ -0,0 +1,57 @@
+/**
+ * No movement hall floor tint may blow out as near-white.
+ *   node --test server/__tests__/floor-brightness.test.js
+ */
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const ROOT = path.join(__dirname, '..', '..');
+const STYLES = fs.readFileSync(path.join(ROOT, 'client/src/data/movement-interior-styles.ts'), 'utf8');
+
+/** Soft ceiling — mid stone / warm wood, not gallery flood. */
+const MAX_FLOOR_LUMINANCE = 0.58;
+
+function luminance(hex) {
+  const n = parseInt(hex.slice(1), 16);
+  const r = (n >> 16) & 255;
+  const g = (n >> 8) & 255;
+  const b = n & 255;
+  return (0.2126 * r + 0.7152 * g + 0.0722 * b) / 255;
+}
+
+function floorTints() {
+  // tints objects inside mk(): wall/ceiling/floor hex triples (optional wallSide)
+  const re =
+    /\{\s*wall:\s*'#[^']+',(?:\s*wallSide:\s*'#[^']+',)?\s*ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/g;
+  const out = [];
+  let m;
+  while ((m = re.exec(STYLES))) out.push(m[1]);
+  return out;
+}
+
+describe('Movement floors — no blown-out brightness', () => {
+  it('every authored floor tint stays at or below mid-stone luminance', () => {
+    const floors = floorTints();
+    assert.ok(floors.length >= 20, `expected many floor tints, got ${floors.length}`);
+    const offenders = floors
+      .map((hex) => ({ hex, L: luminance(hex) }))
+      .filter((f) => f.L > MAX_FLOOR_LUMINANCE);
+    assert.deepEqual(
+      offenders,
+      [],
+      offenders.map((f) => `${f.hex} L=${f.L.toFixed(3)}`).join(', ')
+    );
+  });
+
+  it('Baroque floor is subdued warm marble, not near-white', () => {
+    const start = STYLES.indexOf("'baroque-palace'");
+    assert.ok(start >= 0);
+    const block = STYLES.slice(start, STYLES.indexOf('mk(', start + 1));
+    const m = block.match(/ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/);
+    assert.ok(m);
+    assert.ok(luminance(m[1]) <= MAX_FLOOR_LUMINANCE);
+    assert.doesNotMatch(block, /floor: '#ece8e0'/);
+  });
+});