Streaming replies and STT, amplitude lip-sync, one place for speaking

Latency: replies are spoken sentence-by-sentence off the desk API's NDJSON
endpoint, so the wait is time-to-first-sentence rather than the whole model
call, and Deepgram's live websocket transcribes while you're still talking
instead of uploading the WAV afterwards. Both fall back invisibly — a stream
that fails before anything was said drops to converse(), and a socket that
never opens just means the old one-shot path.

Speaking lived in four near-copies in the controller (a reply, a holding line,
a streamed sentence, a dialogue scene) that had already drifted: one didn't arm
barge-in, another skipped the follow-up rule. It's now speech.Speaker plus an
Utterance describing the policy differences, with collaborators injected so the
whole of it tests without Qt or audio.

The mouth follows the audio rather than a timer: tts.level_of reduces each PCM
frame to a 0..1 loudness on a sqrt curve (speech sits well below peak, and a
linear map leaves the mouth barely open during normal talking) and that indexes
the talking frames, which the sprite script now draws as an openness ramp.
Offline pyttsx3 has no waveform, so stale levels hand control back to the timed
loop instead of freezing the mouth mid-syllable.

Also: the pet starts where you left it (ignoring positions on monitors that are
no longer connected, since restoring those faithfully is how it ends up
somewhere unreachable), and `python -m bolt_pet --doctor` is a preflight that
says what to do about each problem rather than only what's wrong.

tests/test_pipeline_smoke.py breaks the pure-logic rule on purpose. Every unit
test passed all week while notifications sat unspoken for minutes, the pet said
things twice and [laughing] got read aloud — each an interaction between two
individually-correct units. It drives whole turns against a real HTTP server on
a loopback port, faking only the mic and the speakers. It found a NameError in
the paint path that would have fired on every repaint while talking.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bolt_pet/audio/mic.py

@@ -37,6 +37,20 @@ def rms(frame: np.ndarray) -> float:
     return float(np.sqrt(np.mean(frame.astype(np.float64) ** 2)))
 
 
+def _emit(on_frame, frame) -> None:
+    """Hand a frame to a listener without letting it break the capture.
+
+    Streaming STT is an optimisation riding along with recording; if its
+    socket dies mid-utterance the recording must carry on untouched, because
+    the one-shot fallback is about to need the full buffer."""
+    if on_frame is None:
+        return
+    try:
+        on_frame(frame)
+    except Exception:
+        pass
+
+
 def record_utterance(
     stream: AudioStream,
     should_continue=lambda: True,
@@ -47,6 +61,7 @@ def record_utterance(
     grace_s: float = None,
     frame_len: int = config.FRAME_LEN,
     sample_rate: int = config.SAMPLE_RATE,
+    on_frame=None,
 ) -> Optional[np.ndarray]:
     """Capture one utterance from *stream*: wait for speech to start, stop
     after trailing silence. Returns None if nothing usable was heard.
@@ -55,6 +70,11 @@ def record_utterance(
     (e.g. the pet window was closed) without needing threading primitives
     baked into this function.
 
+    *on_frame*, if given, is called with each captured frame while speech is
+    in progress — that is how streaming STT transcribes as you talk rather
+    than after (see audio/stt_stream.py). It is fire-and-forget: this function
+    still returns the full buffer, so a failed stream costs nothing.
+
     *grace_s* is how long to wait for speech to *begin* before giving up.
     The controller stretches it for follow-up questions, where you're being
     asked something and need a moment to think rather than having just said
@@ -83,10 +103,12 @@ def record_utterance(
             if frame_rms >= rms_threshold:
                 started = True
                 frames.append(frame)
+                _emit(on_frame, frame)
             elif waited > grace_frames:
                 return None  # woke it up but said nothing
             continue
         frames.append(frame)
+        _emit(on_frame, frame)
         if frame_rms < rms_threshold:
             silence_frames += 1
             if silence_frames >= silence_limit: