A door/window only carries extras.openable + extras.clips when an open
animation actually bakes. Cased openings (no leaf) and fixed windows (no
operable sash) are no longer mislabelled openable, so the GLB never claims
a part opens when nothing moves. /viewer is unaffected (it already required
openable && clips). Adds a regression test for the no-clip case.
(Export barrels reordered by the formatter.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
