* fix(realtime): resolve saved voice profiles
Realtime pipelines now validate saved voices against the selected TTS model and retain leased audio until session teardown. Each synthesis request receives its own transcript parameter map.
Assisted-by: Codex:GPT-5
* docs(tts): document realtime voice defaults
Show how a realtime pipeline selects a saved Voice Library profile at session start. Clarify which session voice updates remain supported.
Assisted-by: Codex:GPT-5
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Co-authored-by: Ettore Di Giacinto <mudler@localai.io>