Kokoro English speech integration

Original model: hexgrad/Kokoro-82M v1.0, Apache License 2.0.
https://huggingface.co/hexgrad/Kokoro-82M
ONNX export and voice packs: onnx-community/Kokoro-82M-v1.0-ONNX,
revision 1939ad2a8e416c0acfeecc08a694d14ef25f2231, Apache License 2.0.
Only af_heart and am_michael English US voice packs are offered.
French SIWIS and Japanese Koniwa voice packs, whose model card lists
additional Creative Commons attribution, are not included.

Upstream training-data attribution is retained even though only English
voice-style packs are offered:
Koniwa tnc recordings: Television Nishinippon (TNC), collected by Koniwa.
https://github.com/koniwa/koniwa
https://www.tnc.co.jp/announcer/reading/
Creative Commons Attribution 3.0: https://creativecommons.org/licenses/by/3.0/
SIWIS French Speech Synthesis Database (2016), published 2017:
Junichi Yamagishi, Pierre-Edouard Honnet, Philip Garner, Alexandros Lazaridis.
University of Edinburgh, Centre for Speech Technology Research.
https://doi.org/10.7488/ds/1705
Creative Commons Attribution 4.0: https://creativecommons.org/licenses/by/4.0/
The upstream model card reports training on less than one hour of Koniwa tnc
and less than eleven hours of SIWIS. Original recordings are not distributed.

English phonemizer source: wasya-co/head_tts,
revision c08f4ca8b3253b3e908e501486a1e068e606be5c.
language-en-us.mjs, language.mjs and utils.mjs are distributed under MIT,
copyright (c) 2025 Mika Suominen. Only purpose comments were added.
https://github.com/wasya-co/head_tts
The CMU pronunciation dictionary retains its original BSD notice;
copyright (C) 1993-2015 Carnegie Mellon University.
English out-of-dictionary letter-to-sound rules derive from NRL Report 7948
(1976), as documented by the upstream phonemizer.

Inference uses the existing Apache-2.0 Transformers.js and MIT ONNX Runtime.
The separate, unmodified CPU-only SIMD runtime is onnxruntime-web
1.31.0-dev.20260914-8d85527a0, the exact Transformers.js 4.3.0 dependency.
It does not replace Chatterbox's custom GPU runtime.
The upstream runtime's complete dependency notices are reproduced in
ONNXRUNTIME-THIRD-PARTY-NOTICES.txt alongside its MIT project license.
No GPL eSpeak phonemizer or Piper runtime is distributed by this integration.