ship Mac-only: remove iPhone int4 (quality not at bar; runs but degraded)

remove int8km (k-means int8) — superseded by clean sym8

LFM2.5-8B-A1B: sym8 (clean linear int8) Mac bundle

LFM2.5-8B-A1B: int4km (iPhone-jetsam-safe, runs on device) decode-pipelined bundle

LFM2.5-8B-A1B: int8km (Mac, 141 tok/s) decode-pipelined bundle