Add docs index and per-skill docs, link from main README

docs/WEB-AUTOMATION.md

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+# WEB-AUTOMATION
+
+## Purpose
+
+Automate browsing and scraping with Playwright + Camoufox.
+
+## Requirements
+
+- Node.js 20+
+- pnpm
+- `playwright-core`
+- `camoufox-js`
+
+## Setup Summary
+
+1. Install skill files for your agent.
+2. `cd .../skills/web-automation/scripts`
+3. `pnpm install`
+4. `pnpm add playwright-core camoufox-js`
+5. `npx camoufox-js fetch`
+
+## Dependency Checks
+
+```bash
+node -e "require.resolve('playwright-core/package.json');require.resolve('camoufox-js/package.json');console.log('OK: playwright-core + camoufox-js installed')"
+node -e "const fs=require('fs');const t=fs.readFileSync('browse.ts','utf8');if(!/camoufox-js/.test(t)){throw new Error('browse.ts is not configured for Camoufox')}console.log('OK: Camoufox integration detected in browse.ts')"
+```
+
+## Usage Examples
+
+- Browse: `npx tsx browse.ts --url "https://example.com"`
+- Scrape: `npx tsx scrape.ts --url "https://example.com" --mode main --output page.md`
+- Auth: `npx tsx auth.ts --url "https://example.com/login"`