Add motion design skills pack

Installed via npx skills add iart-ai/motion-design-skills. Kept the
project's existing remotion-video skill unchanged.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E35uEC1pGu95tUpM4b815L

.claude/skills/after-effects

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+../../.agents/skills/after-effects

.claude/skills/animation-principles

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+../../.agents/skills/animation-principles

.claude/skills/beat-sync-editing

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+../../.agents/skills/beat-sync-editing

.claude/skills/color-motion

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+../../.agents/skills/color-motion

.claude/skills/logo-animation

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+../../.agents/skills/logo-animation

.claude/skills/motion-art-direction

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+../../.agents/skills/motion-art-direction

.claude/skills/motion-background

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+../../.agents/skills/motion-background

.claude/skills/shot-composition

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+../../.agents/skills/shot-composition