feat: finish Stage 2B continuous sorter realism and local deploy

Unify CAD conveyor on / and /details, add RealSense D435i + contact paddle
physics, keep items moving through scan, lock 7×10 drop validation, and
ship Stage 2 artifacts with production on :3100 (permanent HTTPS still blocked).

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

src/domain/continuousPlayback.test.ts

@@ -22,8 +22,8 @@ import { resolveItem } from '../data/resolveItem';
 
 describe('demoPlaylist', () => {
   it('has classification + safety cases', () => {
-    expect(PLAYLIST_LENGTH).toBe(10);
-    expect(DEMO_PLAYLIST.length).toBe(10);
+    expect(PLAYLIST_LENGTH).toBe(11);
+    expect(DEMO_PLAYLIST.length).toBe(11);
   });
 
   it('has no duplicate case ids', () => {