Scene store holds 3 scenes.
API:
POST /api/v1/scenes · upload a .box fileGET /api/v1/scenes · list scenesGET /api/v1/scenes/{id} · fetch raw sceneGET /api/v1/scenes/{id}/render · static 3D viewerGET /api/v1/scenes/{id}/events · SSE live streamGET /api/v1/live · real-time viewerGET /healthz