• Add Japanese phonemizer using OpenJTalk (pyopenjtalk-plus) in the new ja extra
  • --data.phoneme_type japanese for training; "phoneme_type": "japanese" in a voice config for synthesis
  • espeak-ng has no kanji coverage (it reads out Unicode character names) and no pitch accent
  • Full-context labels are parsed for pitch accent and mapped to IPA, so Japanese voices stay compatible with the IPA-based (espeak) warmstart
• Add script/setup --ja, and install the ja extra in CI so the Japanese tests run
• libpiper: add piper_create_options and piper_create_with_options(), with piper_create() kept as a wrapper for ABI compatibility