feat: add grafex init command

[andresilva-cc]

Summary

• New grafex init CLI command that scaffolds a starter project with tsconfig.json and composition.tsx
• Skips existing files with a "Skipped" message instead of overwriting
• Error handling via try/catch with clean stderr output (consistent with export/dev commands)
• --help / -h flag support
• Updated Getting Started docs and CLI reference on the website
• Updated README quickstart section

Test plan

• Unit tests for CLI routing (grafex init, grafex init --help)
• Integration tests for file creation, skip-existing behavior, and help output
• 304 tests passing

[vercel]

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Project	Deployment	Actions	Updated (UTC)
grafex	Ready	Preview, Comment	Apr 5, 2026 2:40am