Streaming dictation sends one transcription request per ended speech segment.
With redemptionMs=640 the VAD cut on every ~0.64s gap, so normal halting speech
fragmented into many segments and flooded /ai-chat/transcribe — tripping the
per-user rate limit even at modest real usage.
Raise redemptionMs to 1500 so a cut only happens on a real sentence/thought
pause (~the "couple seconds" the feature was meant to use). Request count now
tracks actual pauses rather than inter-word gaps; the server throttle is left
unchanged (the earlier limit bump was treating the symptom).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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