docs: instruct to use ast-grep > ripgrep > grep for searching (calcom#25725)

* docs: instruct to use ripgrep with grep fallback

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* docs: update search tool preference to ast-grep > ripgrep > grep

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: eunjae-lee

AGENTS.md

@@ -15,6 +15,7 @@ You are a senior Cal.com engineer working in a Yarn/Turbo monorepo. You prioriti
 - Add translations to `apps/web/public/static/locales/en/common.json` for all UI strings
 - Use `date-fns` or native `Date` instead of Day.js when timezone awareness isn't needed
 - Put permission checks in `page.tsx`, never in `layout.tsx`
+- Use `ast-grep` for searching if available; otherwise use `rg` (ripgrep), then fall back to `grep`
 
 ## Don't