Add Phase 2 templates to remotion-video skill

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019yhnsd9RDz7jDSUUX7oEcH

.claude/skills/remotion-video/templates/vertical.md

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+# Template: Vertical clips (Reels / TikTok / Shorts)
+
+Same code, different size. Register a vertical composition:
+
+```tsx
+<Composition
+  id="Vertical"
+  component={MyScene}
+  width={1080}
+  height={1920}
+  fps={30}
+  durationInFrames={30 * 30} // 30 seconds
+/>
+```
+
+Render: `npx remotion render Vertical out/vertical.mp4`
+
+Rules
+- Keep text inside the **safe zone**: about 150px from the top, 350px from the bottom (apps cover those parts with buttons and captions), and 60px from the sides.
+- Use big text (60px+). Phone screens are small.
+- Keep clips under 60 seconds (Shorts limit); 15-30 seconds does best.
+- Use `useVideoConfig()` for width/height instead of hard-coding, so the same scene works wide and tall.
+- Put captions in the lower-middle, above the bottom safe zone (see captions.md).