feat(tts): config-driven voices + two-voice dialogue/narration split (DEC-11)
Voice assignment moves from the hardcoded server map to ~/.config/ratatoskr/ voices.json (per-agent voice + optional narration_voice). An agent with a narration_voice gets a two-voice split: quoted speech in `voice`, narration in `narration_voice`, synthesized per-span and stitched under one WAV header. - new src/ratatoskr/voices.py: load_voice_config (degrade-not-crash), segment_dialogue (quote-based, straight + curly), resolve_voice_spans - tts.py: tts_stream_stitched replaces tts_stream — serial per-span synth, span 0 verbatim, spans 1..N header-stripped -> one gapless 48kHz stream; a single-span list is a byte-identical passthrough (no single-voice regression) - server.py: _tts_endpoint resolves spans from app.state.voice_config; the hardcoded _TTS_VOICE_MAP is retired; create_app gains a voice_config param - entrypoint.py: loads voices.json at startup - contract DEC-11 + INV-TTS-5/6/7; initial config donut->donut, sindra->miranda (dialogue) / emmie (narration) Live-verified on :8765: Sindra mixed turn -> 2 dots calls (emmie+miranda) stitched into one 48kHz WAV with a single RIFF header; Donut single-voice unchanged. 545 tests green (incl. new test_voices.py).
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