Add workout videos, editable HyperFrames projects and music tools

- diamond-pushup (with and without music) and bench-dips videos
- Editable project sources for both videos
- make_music.py: original copyright-free music generator

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FXVsD1DgdzZLiPuwtKzMSY

videos/projects/bench-dips/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "app",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "npx --yes hyperframes@0.8.185 preview",
+    "check": "npx --yes hyperframes@0.8.185 check",
+    "render": "npx --yes hyperframes@0.8.185 render",
+    "publish": "npx --yes hyperframes@0.8.185 publish"
+  }
+}