Upgrade Node.js requirement from v20 to v22

Node.js v20 (Iron) will reach end-of-life on April 30, 2026.

So we do the follow works:

- Update all GitHub Actions workflows to use node-version: 22
- Add engines field to package.json requiring Node >=22
- Update AGENTS.md to document Node 22+ requirement
- Add .nvmrc with version 22 for nvm/fnm users

Ref: https://github.com/nodejs/Release

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>

Author: PeterDaveHello

.github/workflows/pr-tests.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 22
       - run: npm ci
       - run: npm test
       - run: npm run lint

.github/workflows/pre-release-build.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 22
           cache: 'npm'
           cache-dependency-path: '**/package-lock.json'
       - name: Detect Node version

.github/workflows/tagged-release.yml

@@ -47,7 +47,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 22
       - run: npm ci
 
       - uses: actions/setup-python@v6

.github/workflows/verify-configs.yml

@@ -12,6 +12,6 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 22
       - run: npm ci
       - run: npm run verify

.nvmrc

@@ -0,0 +1 @@
+22

AGENTS.md

@@ -226,7 +226,7 @@ The extension supports multiple AI providers:
 
 ### Build Issues
 
-- Build failures: Check Node.js version (requires Node 20+), clear caches and rebuild.
+- Build failures: Check Node.js version (requires Node 22+), clear caches and rebuild.
   - macOS/Linux: `rm -rf node_modules && npm ci && rm -rf node_modules/.cache build/ dist/`
   - Windows (PowerShell): `Remove-Item -Recurse -Force node_modules, build, dist; if (Test-Path node_modules\.cache) { Remove-Item -Recurse -Force node_modules\.cache }; npm ci`
 - "Module not found" errors: Usually indicate missing `npm ci`

package-lock.json

@@ -1,5 +1,8 @@
 {
   "name": "chatgptbox",
+  "engines": {
+    "node": ">=22"
+  },
   "scripts": {
     "build": "node build.mjs --production",
     "build:safari": "bash ./safari/build.sh",