feat: implement DrawRhythmTracks and BPMDetector nodes

DrawRhythmTracks generates BPM-synced sparse track point images with
independent X/Y swing patterns (pendulum, bounce, linear). Rendering
is GPU-accelerated and compatible with LTXVDrawTracks output format.

BPMDetector extracts tempo from audio input using librosa beat tracking.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/publish.yml

@@ -0,0 +1,22 @@
+name: Publish to Comfy registry
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - "pyproject.toml"
+
+jobs:
+  publish-node:
+    name: Publish Custom Node to registry
+    runs-on: ubuntu-latest
+    # if this is a forked repository. Skipping the workflow.
+    if: github.event.repository.fork == false
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Publish Custom Node
+        uses: Comfy-Org/publish-node-action@main
+        with:
+          personal_access_token: ${{ secrets.REGISTRY_ACCESS_TOKEN }}