fix(tianji_wuji): nail visual STLs -> used-vertex convex hulls (motion shimmer fix)

fix(tianji_wuji): drop 12 superseded baked tip/softbody visual lines (nail z-fight flicker)

revert(tianji_wuji): drop redundant tip collision geoms from the MJCF

revert(tianji_wuji): drop redundant tip collision from the USD

assets(tianji_wuji): MJCF fingertip/nail collision geoms (+10, gold in collision layer)

assets(tianji_wuji): bake fused tip/nail collision into link4 (+ de-instance fix)

assets(tianji_wuji): fused tip/nail collision STLs (10)

assets(tianji_wuji): MJCF fused visuals — silver nails + visible finger seams

assets(tianji_wuji): fused visual STLs for the MJCF (54 meshes)

assets(tianji_wuji): split material GeomSubsets into meshes (Blender-proof)

assets(tianji_wuji): MJCF rootPlug collision + visual boxes (穿模 fix, MuJoCo side)

assets(tianji_wuji): fused WUJI hand graft — new tianji_wuji.usd + wuji_hand/fused bundle

fix(tianji_wuji): left-hand link2 180-deg frame flip + joint2 sense flip (5 fingers) (#4)

fix(tianji_wuji+meshy): sync render fixes from roboverse_data PR #34 (#3)

Sync robots/tianji_wuji OmniPBR material rebuild from roboverse_data #31

Duplicate from SomaStacksOrg/roboverse_data