* fix(tts-local-cli): handle stdout/stderr stream errors in speech provider
CLI TTS speech provider spawns a child process to generate audio and
registers stdout/stderr data listeners but omits stream error handlers.
stdout carries synthesized audio data. A pipe error mid-generation must
reject the promise so the caller does not silently receive truncated
audio when the child later exits zero. stderr carries diagnostic logs
only — errors there are benign and should not crash the provider.
Apply separate strategies matching vincentkoc's requirement:
- stdout (audio): error → reject(Promise) — surface the failure
- stderr (diagnostic): error → ignore — does not affect audio output
* fix lint: remove unused signal param from mock kill()
* fix(tts-local-cli): contain child stream failures
Co-authored-by: 赵旺0668001248 <zhao.wang1@xydigit.com>
* chore(tts-local-cli): keep release notes in PR body
---------
Co-authored-by: Peter Steinberger <steipete@gmail.com>
