Margin voice — Kokoro-82M for the Margin e-reader

• Kokoro-82M model weights (Apache-2.0, from hexgrad/Kokoro-82M), byte-identical to the kokoro-v1_0.safetensors conversion shipped with mlalma/KokoroTestApp, the reference app of the kokoro-ios MLX-Swift port the app pins.
• One voice-style tensor — af_heart, shape (510, 1, 256) float32 — stored under the key voices.af_heart. The port's weight loader ignores unknown key prefixes, so the same file serves as model + voice: one download, one pinned SHA-256 in the app.