docs(motion-gpu): streamline readmes

[66HEX]

Summary by CodeRabbit

• Documentation
  • Condensed the main and package README files into concise overviews of Motion GPU.
  • Added installation guidance, framework entry points, core capabilities, WebGPU requirements, documentation links, Context7 availability, and MIT licensing information.
  • Removed detailed comparisons, tutorials, API contracts, runtime guidance, validation rules, and development/performance instructions.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: 93fe0e4d-f95a-4ddb-a5f9-b2b3b076bf5b

📥 Commits

Reviewing files that changed from the base of the PR and between af79f95 and 52cdd9a.

📒 Files selected for processing (2)

• README.md
• packages/motion-gpu/README.md

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📝 Walkthrough

Walkthrough

The root and package READMEs were substantially condensed. They now focus on Motion GPU’s purpose, installation, entry points, capabilities, WebGPU requirements, documentation links, Context7 access, and licensing.

Changes

Documentation consolidation

Layer / File(s)	Summary
README overview and package documentation README.md, packages/motion-gpu/README.md	Both READMEs replace detailed usage, runtime, validation, development, and performance sections with concise product and installation documentation. The package README also adds a centered title.

Estimated code review effort: 1 (Trivial) | ~5 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/streamline-readmes

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