fix: configure husky and lint-staged for pnpm monorepo (#384)

# Improve Developer Experience with Husky and lint-staged for pnpm
Monorepo

## Summary
This PR enhances the developer experience by configuring Husky and
lint-staged to work properly with our pnpm monorepo structure. It
centralizes Git hooks at the root level and ensures consistent code
quality across the project.

## Changes
- Centralized Husky and lint-staged configuration at the monorepo root
- Added pre-commit hook that runs lint-staged to enforce code quality
- Configured lint-staged to:
  - Format JSON, MD, and YAML files with Prettier
  - Lint and typecheck TypeScript files before commits
- Fixed release script in codex-cli package.json (changed "pmpm" to "npm
publish")
- Removed duplicate Husky and lint-staged configurations from codex-cli
package.json

## Benefits
- **Consistent Code Quality**: Ensures all committed code meets project
standards
- **Automated Formatting**: Automatically formats code during commits
- **Early Error Detection**: Catches type errors and lint issues before
they're committed
- **Centralized Configuration**: Easier to maintain and update in one
place
- **Improved Collaboration**: Ensures consistent code style across the
team

## Future Improvements
We could further enhance this setup by
**Commit Message Validation**: Add commitlint to enforce conventional
commit messages

---------

Co-authored-by: Thibault Sottiaux <tibo@openai.com>

package.json

@@ -10,12 +10,14 @@
     "test": "pnpm --filter @openai/codex run test",
     "lint": "pnpm --filter @openai/codex run lint",
     "typecheck": "pnpm --filter @openai/codex run typecheck",
+    "changelog": "git-cliff --config cliff.toml --output CHANGELOG.ignore.md $LAST_RELEASE_TAG..HEAD",
     "prepare": "husky",
-    "changelog": "git-cliff --config cliff.toml --output CHANGELOG.ignore.md $LAST_RELEASE_TAG..HEAD"
+    "husky:add": "husky add"
   },
   "devDependencies": {
     "git-cliff": "^2.8.0",
     "husky": "^9.1.7",
+    "lint-staged": "^15.5.1",
     "prettier": "^3.5.3"
   },
   "resolutions": {
@@ -30,5 +32,14 @@
     "node": ">=22",
     "pnpm": ">=9.0.0"
   },
+  "lint-staged": {
+    "*.json": "prettier --write",
+    "*.md": "prettier --write",
+    ".github/workflows/*.yml": "prettier --write",
+    "**/*.{js,ts,tsx}": [
+      "pnpm --filter @openai/codex run lint",
+      "pnpm --filter @openai/codex run typecheck"
+    ]
+  },
   "packageManager": "pnpm@10.8.1"
 }