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__/high-renaissance-interior.test.js

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+/**
+ * High Renaissance (cinquecento) must not flood the hall with tiny contrast
+ * tiles or gold ring ornaments in every coffer.
+ *   node --test server/__tests__/high-renaissance-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');
+const DETAILS = fs.readFileSync(path.join(ROOT, 'client/src/components/hall-details/classical.tsx'), 'utf8');
+
+function styleBlock() {
+  const start = STYLES.indexOf("'high-renaissance-palazzo'");
+  assert.ok(start >= 0);
+  return STYLES.slice(start, STYLES.indexOf('mk(', start + 1));
+}
+
+function cinquecentoBlock() {
+  const start = DETAILS.indexOf('export function CinquecentoDetails');
+  assert.ok(start >= 0);
+  const next = DETAILS.indexOf('export function ', start + 1);
+  return DETAILS.slice(start, next > start ? next : DETAILS.length);
+}
+
+describe('High Renaissance interior — quieter surfaces', () => {
+  it('does not use high-contrast marble-checker flooring', () => {
+    const block = styleBlock();
+    assert.doesNotMatch(block, /floor: 'marble-checker'/);
+    assert.match(block, /floor: 'marble-veined-carrara'|floor: 'terrazzo'|floor: 'parquet/);
+  });
+
+  it('Cinquecento coffers have no gold rosette rings', () => {
+    const block = cinquecentoBlock();
+    assert.doesNotMatch(block, /rosette=\{trim\}/);
+    assert.match(block, /CofferedCeiling/);
+  });
+});