Add Playwright+Camoufox prerequisite checks to web-automation skill docs

docs/install.md

@@ -71,6 +71,14 @@ Requirements for `web-automation`:
 - Node.js 20+
 - pnpm
 - Browser download/network access for Camoufox
+- `playwright-core` and `camoufox-js` installed in the skill scripts workspace
+
+Dependency verification (run in your installed `scripts/` folder):
+
+```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')"
+```
 
 ## 4) Verify