feat(registry): add beat-freeze-cut

Beat-driven speed ramp, freeze-frame hit, and hard cut for music-led
promos and montages. Contributed as #2957; applied here as content so the
whole catalog set lands together.

Verified by rendering: 6s, clean, deterministic (the one Math.random hit
is a comment above a fixed pattern array). Opaque root, so no demo.html
is needed for its catalog preview.

Co-authored-by: akiyoshisan1218 <akiyoshisan1218@users.noreply.github.com>

docs/catalog/blocks/beat-freeze-cut.mdx

@@ -0,0 +1,44 @@
+---
+title: "Beat Freeze Cut"
+description: "A beat-driven speed ramp, freeze-frame hit, and hard-cut sequence for music-led promos and montages."
+---
+
+# Beat Freeze Cut
+
+A beat-driven speed ramp, freeze-frame hit, and hard-cut sequence for music-led promos and montages.
+
+`transition` `music` `beat-driven` `freeze-frame`
+
+<video className="w-full aspect-video rounded-xl object-cover bg-zinc-100 dark:bg-zinc-800" src="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/beat-freeze-cut.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/beat-freeze-cut.png" autoPlay muted loop playsInline />
+
+## Install
+
+<CodeGroup>
+
+```bash Terminal
+npx hyperframes add beat-freeze-cut
+```
+
+</CodeGroup>
+
+## Details
+
+| Property | Value |
+| --- | --- |
+| Type | Block |
+| Dimensions | 1920×1080 |
+| Duration | 6s |
+
+## Files
+
+| File | Target | Type |
+| --- | --- | --- |
+| `beat-freeze-cut.html` | `compositions/beat-freeze-cut.html` | hyperframes:composition |
+
+## Usage
+
+After installing, add the block to your host composition:
+
+```html
+<div data-composition-id="beat-freeze-cut" data-composition-src="compositions/beat-freeze-cut.html" data-start="0" data-duration="6" data-track-index="1" data-width="1920" data-height="1080"></div>
+```