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Improve depth-precision - #81
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…on the sr64 fork Cherry-picked from upstream 1029791 (Max Bebök, 2026-10-06): keyframes stream from ROM by DMA through a small double buffer per animation instead of a FILE, T3DBone keeps a 4x3 matrix (96 B, 16-aligned), and the skeleton/animation update paths are faster. Only HailToDodongo#84 — the precision fix (HailToDodongo#81) and the RSPL microcode port stay for the full upstream update, so upstream's breakingChanges.md (which documents both) is left out. Conflicts with the fork, resolved: - The fork's memory keyframe source (dataPtr) is replaced by upstream's ROM stream. sr64 builds its animations by hand around its own T3DChunkAnim, so a new t3d_anim_set_source_rom() starts the stream from a ROM address with a CALLER-supplied buffer; T3DAnim.ownsBuffer tells t3d_anim_destroy / _destroy_free whether tiny3d allocated the buffer (and frees it) or the caller did (and keeps it). destroy_free waits for the stream's DMA before anything is released. - The fork's no-source safety stays: an animation with no stream reads no keyframes (a static pose) instead of DMAing into NULL, and a channel whose window never opened is skipped instead of divided by zero. - Weighted skinning: the inverse bind poses are 4x3 too (48 B per bone, was 64), computed once at create through the existing 4x4 affine invert, and the skin matrix is mat4x3_mul(world, IBM) -> mat4x3_to_fixed. A clone without inverse bind poses takes upstream's plain path. Measured in sr64 (b30, 24-actor fight): the animation pool's demand peak 161 -> 136 KB and its 46 fragmentation spills -> 0. (cherry picked from commit 1029791)
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