Survive a ComfyUI crash, retry clips the model cuts short

Crash recovery
  ComfyUI's queue and history do not persist across a restart, so a prompt
  submitted before a crash exists nowhere afterwards. The old poll loop waited
  on that dead prompt for ever, and its error branch skipped the backoff, so it
  hammered the closed port four times a second printing "Poll error" on every
  attempt.

  run_workflow() replaces wait_for_completion(). It reports once when the
  backend goes away and once when it returns, polls every 3s in between, and on
  reconnect checks both /history and /queue: if the prompt is in neither, the
  queue did not survive and the clip is submitted again. When it cannot tell, it
  assumes the job is still alive — resubmitting a running job would waste a
  generation.

  It also starts ComfyUI itself, via the script named by [comfy] start_command,
  in a new terminal window. Guarded by a 90s cooldown and 3 attempts per run so
  a backend that dies during startup cannot spawn an endless stream of windows;
  the window pauses on exit so a failed start leaves its error on screen. Falls
  back to a background launch with a log file when there is no display. Set
  [comfy] autostart = no, or pass --no-comfy-autostart, to turn it off.

Clips cut short mid-word
  About one clip in twelve comes back truncated: the model stops before the line
  is finished. Measured on raw ComfyUI output, 6 of 80 recent clips, and 15 of
  472 in one episode. It is invisible in the text but obvious in the audio — a
  finished clip decays to about -65 dB, a cut one stops at about -16 dB.

  Truncated clips are now regenerated with a distant seed, up to
  [tts] truncation_retries extra attempts, and a run that still has bad clips
  ends by printing them as a ready-made --regen list. --check-clips reports the
  same for a job already on disk.

  Worth recording what this is NOT: the trailing-silence trimming added earlier
  was suspected, and cleared. It only cuts silence that runs to end of file, so
  a pause between words never triggers it — verified against six synthetic cases
  including a 1.2s mid-clip pause, and against real clips containing pauses. The
  truncation is present in ComfyUI's own output before this script touches it.

settings.ini
  New: [tts] truncation_retries, [comfy] autostart and start_command, all
  documented in place. The editor renders yes/no keys as a dropdown.

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

settings.ini

@@ -29,6 +29,11 @@ temperature = 0.6
 # mid-word.
 max_tokens = 4096
 
+# Roughly one clip in twelve comes back cut off mid-word. Those are detected and
+# asked for again with a different seed, up to this many extra attempts. 0 to
+# switch retrying off.
+truncation_retries = 2
+
 # Trim this many ms from the start of every clip, to remove an inhale artifact.
 # Try 80-150 if you hear one. Too high clips the first consonant.
 strip_leading_ms = 0
@@ -54,3 +59,13 @@ output_dir = output
 [comfy]
 # Address of the ComfyUI backend running Higgs Audio V3.
 comfy_url = http://127.0.0.1:8189
+
+# Start ComfyUI automatically when it stops answering. A crash loses its queue,
+# so the clip in flight is resubmitted once the backend is back. At most 3
+# attempts per run, 90s apart, so a backend that dies on startup cannot spawn an
+# endless stream of terminal windows. yes/no.
+autostart = yes
+
+# The script used to start it. Relative paths are resolved next to
+# lektor_ai_comfy.py.
+start_command = start_comfyui.sh