feat(stt-log): log the WHOLE turn pipeline to the transcript channel

The transcript channel only showed successful transcripts, so dropped utterances
(the 47/50 misses) were invisible. Now every captured utterance is mirrored with
its outcome and per-stage timing:
- too-short blip (<300ms), VAD "음성 아님(VAD 차단)", "인식 실패", "답변 없음", or "ok"
- transcript + reply (or "(무응답)")
- ⏱️ stt/llm seconds

The bridge meta now carries note + stt_sec + think_sec; voice.ts fires onTurn for
every turn (not only non-empty transcripts) and for the too-short drop; userbot
formats the diagnostic line.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

bot/src/bridge.ts

@@ -45,6 +45,11 @@ export interface ConverseMeta {
   reply: string;
   error?: string | null;
   broadcast_action?: BroadcastAction | null;
+  /** Why this turn produced (or didn't produce) a transcript/reply. */
+  note?: string;
+  /** Per-stage timing (seconds) for diagnosing latency. */
+  stt_sec?: number;
+  think_sec?: number;
 }
 
 export interface ConverseStreamHandlers {

bot/src/userbot.ts

@@ -34,16 +34,33 @@ async function loadSelfbot(): Promise<any> {
   }
 }
 
-/** Mirror a heard voice turn (transcript + reply) into a text channel. */
-async function postTranscript(client: AnyClient, transcript: string, reply: string): Promise<void> {
+interface TurnInfo {
+  transcript: string;
+  reply: string;
+  note?: string;
+  sttSec?: number;
+  thinkSec?: number;
+}
+
+/** Mirror EVERY heard utterance (and why it did/didn't answer) to a text
+ *  channel, so misses and latency are diagnosable without hearing the bot. */
+async function postTranscript(client: AnyClient, info: TurnInfo): Promise<void> {
   const chId = config.transcriptChannelId;
   if (!chId) return;
+  const timing =
+    info.sttSec != null || info.thinkSec != null
+      ? `  ⏱️ stt ${info.sttSec ?? "?"}s · llm ${info.thinkSec ?? "?"}s`
+      : "";
+  let msg: string;
+  if (info.transcript) {
+    const r = (info.reply || "").trim();
+    msg = `🎤 들음 → 🗣️ "${info.transcript}"\n🤖 답변: ${r || "(무응답)"}${timing}`;
+  } else {
+    msg = `🎤 들음 → ❌ ${info.note || "무시됨"}${timing}`;
+  }
   try {
     const ch: any = await client.channels.fetch(chId).catch(() => null);
-    if (ch?.send) {
-      const r = (reply || "").trim();
-      await ch.send(`🗣️ 들은 말: ${transcript}\n🤖 답변: ${r || "(무응답)"}`);
-    }
+    if (ch?.send) await ch.send(msg);
   } catch (e) {
     console.error("[userbot] transcript post failed:", e);
   }
@@ -58,11 +75,11 @@ async function joinAndListen(client: AnyClient, channelId: string): Promise<void
   // The selfbot VoiceChannel is runtime-compatible with @discordjs/voice's
   // joinVoiceChannel (it exposes id, guild.id and guild.voiceAdapterCreator).
   const session = await joinChannel(channel as unknown as VoiceBasedChannel);
-  session.onTurn = ({ transcript, reply }) => {
-    console.log(`🗣️  ${transcript}\n🤖 ${reply}`);
-    // Mirror every heard utterance (and the reply, if any) to a text channel so
-    // you can see what the bot understood even when it doesn't answer aloud.
-    void postTranscript(client, transcript, reply);
+  session.onTurn = (info) => {
+    console.log(`🗣️  ${info.transcript || "(" + (info.note || "empty") + ")"}\n🤖 ${info.reply}`);
+    // Mirror every heard utterance (and the reply / drop reason) to a text
+    // channel so you can see what the bot understood even when it doesn't answer.
+    void postTranscript(client, info);
   };
   // Screen-share mode (STREAM_BROWSER=true): auto-start the broadcast on join,
   // report its live state to the brain each turn, and let the brain toggle it by

bot/src/voice.ts

@@ -69,8 +69,17 @@ export class VoiceSession {
   /** Pending reply clips. Played one at a time so concurrent speakers don't
    *  cut each other's replies off. */
   private playQueue: Buffer[] = [];
-  /** Optional callback to surface transcripts/replies to a text channel. */
-  onTurn?: (info: { user: string; transcript: string; reply: string }) => void;
+  /** Optional callback to surface EVERY heard utterance (and its outcome) to a
+   *  text channel — including ones dropped before/at STT — so misses are
+   *  diagnosable. `note` says why (e.g. "음성 아님(VAD 차단)", "너무 짧음", "ok"). */
+  onTurn?: (info: {
+    user: string;
+    transcript: string;
+    reply: string;
+    note?: string;
+    sttSec?: number;
+    thinkSec?: number;
+  }) => void;
   /** Live screen-share state, sent with each turn so the brain routes search
    *  (Chrome while broadcasting, Gemini when off). */
   getBroadcasting?: () => boolean;
@@ -123,8 +132,12 @@ export class VoiceSession {
 
     if (!chunks.length) return;
     const mono = stereoToMono(Buffer.concat(chunks));
-    // Ignore blips shorter than ~300ms (likely noise / key clicks).
-    if (mono.length < DISCORD_RATE * 0.3 * 2) return;
+    // Ignore blips shorter than ~300ms (likely noise / key clicks) — but still
+    // report them so the transcript channel shows every captured utterance.
+    if (mono.length < DISCORD_RATE * 0.3 * 2) {
+      this.onTurn?.({ user: userId, transcript: "", reply: "", note: "너무 짧음(<300ms)" });
+      return;
+    }
     const wav = pcm16MonoToWav(mono, DISCORD_RATE);
 
     try {
@@ -133,9 +146,16 @@ export class VoiceSession {
       // so the first sentence starts playing while the rest are still spoken.
       await converseStream(wav, this.getBroadcasting?.(), {
         onMeta: async (meta) => {
-          if (meta.transcript) {
-            this.onTurn?.({ user: userId, transcript: meta.transcript, reply: meta.reply });
-          }
+          // Report EVERY turn (even empty/VAD-dropped) so the transcript channel
+          // explains why a turn did or didn't answer.
+          this.onTurn?.({
+            user: userId,
+            transcript: meta.transcript,
+            reply: meta.reply,
+            note: meta.note,
+            sttSec: meta.stt_sec,
+            thinkSec: meta.think_sec,
+          });
           // Apply any broadcast directive the brain requested (e.g. user said
           // "방송 켜줘 / 꺼줘") before the reply audio plays. The meta line
           // always precedes the audio clips, so awaiting here preserves order.