conversations come back as conversations

A probe on the torch stage worker (~/dockers/torch-worker) runs beside every
transcription and decides what the recording is: solo dictation returns as
paragraphs exactly as before, several voices return speaker-labeled with
conversation: true. Nobody declares which — the caller cannot know.

Transcription and the worker each get a serial FIFO queue on their own
resource, so the probe costs a solo memo nothing and multi-user traffic
stays fair. The worker is optional and best-effort throughout: unreachable
or failing, everything still transcribes, just never labeled.

Speaker attribution is segment-granularity by maximal turn overlap —
whisper.cpp's own timestamps, no alignment stage. If boundaries prove
sloppy, wav2vec2 alignment returns as a worker endpoint.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sidecar/transcribe.ts

@@ -30,6 +30,9 @@ type TranscribeArgs = {
 export type TranscribeResult = {
   text: string;
   detectedLanguage: string;
+  /** Raw Whisper segments, kept for speaker attribution (conversation.ts). Not part of the HTTP
+   *  response — index.ts decides what leaves the sidecar. */
+  segments: WhisperSegment[];
 };
 
 // Above this probability Whisper's own detection is taken as authoritative. Below it the clip is
@@ -281,12 +284,12 @@ export type WhisperSegment = {
 
 // Defaults are chosen so a segment missing either field is kept: dropping real speech is much worse
 // than keeping a stray word.
-const isHallucinatedSilence = (segment: WhisperSegment) =>
+export const isHallucinatedSilence = (segment: WhisperSegment) =>
   (segment.no_speech_prob ?? 0) > NO_SPEECH_PROB && (segment.avg_logprob ?? 0) < LOW_CONFIDENCE_LOGPROB;
 
 // Whisper emits each segment with a leading space and now and then strands trailing punctuation in a
 // segment of its own, which is why the old `response_format=text` output contained lone "." lines.
-const appendSegment = (paragraph: string, text: string) => {
+export const appendSegment = (paragraph: string, text: string) => {
   if (!paragraph) return text;
   return /^[.,;:!?…)\]]/.test(text) ? paragraph + text : `${paragraph} ${text}`;
 };
@@ -412,5 +415,5 @@ export async function transcribeAudio({
   const segments = json.segments ?? [];
   const text = segments.length > 0 ? toParagraphs(segments) : (json.text ?? '').trim();
 
-  return { text, detectedLanguage };
+  return { text, detectedLanguage, segments };
 }