Audio processor: validated voice profiling accuracy, tuned threshold

- Fine-grained speaker analysis (3s windows, 1s hop) across 42min episode
- Host voice: 0.90-0.98 similarity (clear positive match)
- Callers: 0.65-0.68 (correctly below threshold)
- Produced audio/clips: 0.53-0.65 (correctly identified as non-host)
- Co-host/other speakers: 0.56-0.62 (correctly identified)
- Tuned host_match_threshold from 0.75 to 0.83 based on empirical data
- Cross-referenced dips with transcript: correctly identifies callers,
  show intros, played audio clips, and station breaks
- Batch transcription of 7 additional training episodes in progress

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

projects/radio-show/audio-processor/config.yaml

@@ -39,7 +39,7 @@ diarization:
   min_speakers: 1
   max_speakers: 6
   voice_profiles_dir: "voice-profiles/"
-  host_match_threshold: 0.75
+  host_match_threshold: 0.83
 
 llm:
   model: "qwen3:14b"