Add remotion-video skill (#1)

* Add remotion-video skill Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019yhnsd9RDz7jDSUUX7oEcH * 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 * Fix captions template background; document browser flag after test render Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019yhnsd9RDz7jDSUUX7oEcH * Add audio/voiceover template (Phase 3), tested with real render Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019yhnsd9RDz7jDSUUX7oEcH * Document font loading and its network requirement; captions-over-video verified Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019yhnsd9RDz7jDSUUX7oEcH --------- Co-authored-by: Claude <noreply@anthropic.com>
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+# Template: Captions
+
+Words appear in time with speech. Give each word a start time in seconds.
+
+`src/Captions.tsx`
+```tsx
+import { AbsoluteFill, useCurrentFrame, useVideoConfig } from "remotion";
+
+type Word = { text: string; start: number; end: number }; // seconds
+
+export const Captions = ({ words, background = "#111" }: { words: Word[]; background?: string }) => {
+  const frame = useCurrentFrame();
+  const { fps } = useVideoConfig();
+  const t = frame / fps;
+
+  // Show a window of up to 5 words around the current one.
+  const current = words.findIndex((w) => t >= w.start && t < w.end);
+  const i = current === -1 ? 0 : current;
+  const visible = words.slice(Math.floor(i / 5) * 5, Math.floor(i / 5) * 5 + 5);
+
+  return (
+    <AbsoluteFill style={{ backgroundColor: background, justifyContent: "flex-end", alignItems: "center", paddingBottom: 200 }}>
+      <div style={{ fontSize: 72, fontWeight: 800, color: "white", textShadow: "0 4px 12px black", textAlign: "center", maxWidth: "80%" }}>
+        {visible.map((w, k) => (
+          <span key={k} style={{ color: t >= w.start && t < w.end ? "#ffd400" : "white", marginRight: 16 }}>
+            {w.text}
+          </span>
+        ))}
+      </div>
+    </AbsoluteFill>
+  );
+};
+```
+
+Tips
+- Get word times from a transcription tool (e.g. `@remotion/captions` or Whisper) and save them as JSON in `public/`.
+- `background` is the backdrop when there is no video. Pass `"transparent"` when layering over a video.
+- Layer it over the video: `<AbsoluteFill><OffthreadVideo src={staticFile("clip.mp4")} /><Captions words={words} background="transparent" /></AbsoluteFill>`.