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__/neoclassical-interior.test.js

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+/**
+ * Neoclassical museum floor must not blow out as near-white marble.
+ *   node --test server/__tests__/neoclassical-interior.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');
+
+function neoclassicalBlock() {
+  const start = STYLES.indexOf("'neoclassical-museum'");
+  assert.ok(start >= 0, 'neoclassical-museum style must exist');
+  const next = STYLES.indexOf('mk(', start + 1);
+  return STYLES.slice(start, next > start ? next : undefined);
+}
+
+function floorTintHex(block) {
+  const m = block.match(/floor:\s*'#[0-9a-fA-F]{6}'/);
+  assert.ok(m, 'floor tint hex must be present in tints object');
+  // Prefer the tints line: `{ wall: '...', ceiling: '...', floor: '#......', trim: '...' }`
+  const tints = block.match(/\{\s*wall:\s*'#[^']+',\s*ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/);
+  assert.ok(tints, 'tints.floor must be a hex color');
+  return tints[1];
+}
+
+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;
+}
+
+describe('Neoclassical interior — subdued stone floor', () => {
+  it('floor tint is mid stone grey, not near-white', () => {
+    const block = neoclassicalBlock();
+    const hex = floorTintHex(block);
+    assert.ok(luminance(hex) < 0.62, `floor luminance ${luminance(hex).toFixed(2)} for ${hex} is still too bright`);
+    assert.doesNotMatch(block, /floor: '#eceae6'/);
+  });
+
+  it('skylight is not overdriven for the marble floor', () => {
+    const block = neoclassicalBlock();
+    const sky = block.match(/style: 'skylight',\s*lightColor: '[^']+',\s*lightIntensity:\s*([0-9.]+)/);
+    assert.ok(sky, 'skylight must exist');
+    assert.ok(Number(sky[1]) <= 3.6, `skylight intensity ${sky[1]} is still too strong`);
+  });
+});