Add SxCP Audio Wave + Segments: interactive waveform node (upload/play/click-segments)

New node with a JS widget (web/audio_wave.js): upload an audio clip, play it, and click
the waveform to place segment boundaries (click add / drag move / dblclick note /
shift|right-click delete). Boundaries+notes serialize to a hidden segments_json that
drives Python segmentation (falls back to auto-split / notes syntax). Python node
(nodes/audio_wave_segments.py) loads the file (torchaudio/soundfile/librosa), builds
segments from the boundaries, and outputs waveform_image + audio_summary + AUDIO — same
contract as Audio Prompt Guide, so it feeds chat mode the same way. _attach_notes now
merges (keeps clicked notes). WEB_DIRECTORY re-enabled. JS is a first cut — needs testing
in ComfyUI (console logs on error); the Python node works standalone via segments_json/notes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

requirements.txt

@@ -11,5 +11,8 @@ bitsandbytes
 # optional, for the Audio Prompt Guide node — adds tempo (BPM) + beat times
 # (energy envelope + segments work without it):
 # librosa
+# for the Audio Wave + Segments node to LOAD an uploaded file (one of these; torchaudio
+# usually ships with torch): torchaudio / soundfile / librosa
+# soundfile
 # optional, for faster attention on the RTX 5090:
 # flash-attn