Add client-creep — CLI to trace why Next.js components are client components

[DhruvilChauahan0210]

What is client-creep?

client-creep is a zero-setup CLI that statically analyzes any Next.js App Router project and answers three questions no existing tool answers together:

1. Why is this a client component? — full import chain trace to the "use client" boundary
2. Did it need to be? — flags components with no hooks/browser APIs (accidental creep)
3. What does it cost? — estimated KB per boundary + total recoverable

```bash
npx client-creep
```

• Works on Next.js 13, 14, 15, and 16 (unlike runtime alternatives that require Next 16+)
• Zero config, no app running required — purely static analysis
• Supports `--html` (interactive D3 graph), `--watch`, `--ci`, `--budget`, and monorepo workspaces

Tested on the dub.co codebase: 1,073 client components, 643 KB potentially recoverable.

npm: https://www.npmjs.com/package/client-creep