feat: port remotion-video-creation skill (29 rules), restore missing files

New skill:
- remotion-video-creation: 29 domain-specific Remotion rules covering 3D/Three.js,
  animations, audio, captions, charts, compositions, fonts, GIFs, Lottie,
  measuring, sequencing, tailwind, text animations, timing, transitions,
  trimming, and video embedding. Ported from personal skills.

Restored:
- autonomous-agent-harness/SKILL.md (was in commit but missing from worktree)
- lead-intelligence/ (full directory restored from branch commit)

Updated:
- manifests/install-modules.json: added remotion-video-creation to media-generation
- README.md + AGENTS.md: synced counts to 139 skills

Catalog validates: 30 agents, 60 commands, 139 skills.

skills/remotion-video-creation/rules/trimming.md

@@ -0,0 +1,53 @@
+---
+name: trimming
+description: Trimming patterns for Remotion - cut the beginning or end of animations
+metadata:
+  tags: sequence, trim, clip, cut, offset
+---
+
+Use `<Sequence>` with a negative `from` value to trim the start of an animation.
+
+## Trim the Beginning
+
+A negative `from` value shifts time backwards, making the animation start partway through:
+
+```tsx
+import { Sequence, useVideoConfig } from "remotion";
+
+const fps = useVideoConfig();
+
+<Sequence from={-0.5 * fps}>
+  <MyAnimation />
+</Sequence>
+```
+
+The animation appears 15 frames into its progress - the first 15 frames are trimmed off.
+Inside `<MyAnimation>`, `useCurrentFrame()` starts at 15 instead of 0.
+
+## Trim the End
+
+Use `durationInFrames` to unmount content after a specified duration:
+
+```tsx
+
+<Sequence durationInFrames={1.5 * fps}>
+  <MyAnimation />
+</Sequence>
+```
+
+The animation plays for 45 frames, then the component unmounts.
+
+## Trim and Delay
+
+Nest sequences to both trim the beginning and delay when it appears:
+
+```tsx
+<Sequence from={30}>
+  <Sequence from={-15}>
+    <MyAnimation />
+  </Sequence>
+</Sequence>
+```
+
+The inner sequence trims 15 frames from the start, and the outer sequence delays the result by 30 frames.
+