Fixes#2980
A glue scene's seat read only a rotation and scale parked on global-sequence keys, once, when the scene was built. That lost a seat keyed in the scene's sequence: a custom `UI_CharacterSelect` turns its seat bone 180° and scales it 0.673 there, so the body stood backwards at about 1.5×. No stock scene keys its seat that way.
The reference seats a child at the bone's whole animated matrix times the attachment position, every frame (`0x7140d8`-`0x714149`), after it animates the scene (`0x714000`). The body and the pet now take that matrix from the scene rig's pose each frame. This runs in `PostUpdate` after the rig's model pass, now the named set `RigModelPass`, and before propagation, so the seat and the scene share a frame.
Test: `a_seat_takes_the_bones_whole_matrix_at_the_attachment`.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Sam <samuv.eth@gmail.com>
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