Add TikTok video skills (caption-animation, countdown-video, lower-thirds, short-form-video)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011XhxckAYjGMLrLECWuKBzg

.agents/skills/short-form-video/README.md

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+# Short-Form Video
+
+Engineer a 9:16 video that survives the swipe. Short-form is a retention machine, not a small launch film: a hook that earns the first second, pattern interrupts that reset attention every few seconds, and often a loop that buys watch-time past 100%. The craft is timing, not polish. For creators making Reels, TikToks, and YouTube Shorts (7–60s, vertical).
+
+## When it activates
+
+- "Make a Reels/TikTok/YouTube Shorts video" or "build a short-form video template."
+- "Write a hook for a short" or "fix the first 3 seconds."
+- "Edit for retention," "add pattern interrupts," or "pace cuts for a vertical video."
+- "Make a video loop" or "set up 9:16 safe areas."
+
+## Example prompts
+
+- "Build a reusable 9:16 short-form template — one design, many topics."
+- "Fix the drop-off in this Reel: tighten pacing and add pattern interrupts."
+- "Write three hook options for a 30-second educational short."
+
+## What's inside
+
+- `SKILL.md` — the retention arc, hook grammar, and pacing rules.
+- `references/retention-pacing.md` — deeper guidance on retention editing and pacing.
+
+---
+Part of **[Short-Form Video Skills](../../)** · Built by **[iart.ai](https://iart.ai/?utm_source=github&utm_medium=readme&utm_campaign=tiktok-video-skills&utm_content=skill_footer&utm_term=short-form-video)** — the AI motion agent for editable, on-brand motion graphics.