Septa 0.1.0 — cleaner model

Q5_K_M GGUF for the Septa sidecar (POST /v1/clean).

./install.sh downloads this automatically when the fused MLX weights are not next to the repo. The Mac app source is on main; this asset is only the 0.6B cleaner so git stays small.

Exact-match on held-out fixtures: 30/30.