mlx-native 0.12.1

What's Changed

• feat(kv): add unequal-capacity banked TQ arenas by @robertelee78 in #33
• fix(release): exclude local memory artifacts by @robertelee78 in #34
• feat(embedding): execute Q4_0 rows natively by @robertelee78 in #35

Full Changelog: v0.12.0...v0.12.1