Update CI to test Node 20.x and 22.x with better job names

Changes:
- Remove Node 18.x from test matrix (outdated)
- Add Node 22.x to test matrix
- Update job names to show both OS and Node version
  e.g., "Test (ubuntu-latest, Node 20.x)"
- Update package.json engines to require Node >=20.0.0

Now testing on 6 configurations:
- ubuntu-latest: Node 20.x, 22.x
- macos-latest: Node 20.x, 22.x
- windows-latest: Node 20.x, 22.x

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: rathboma

.github/workflows/test.yml

@@ -14,14 +14,14 @@ concurrency:
 
 jobs:
   test:
-    name: Test on ${{ matrix.os }}
+    name: Test (${{ matrix.os }}, Node ${{ matrix.node-version }})
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node-version: [18.x, 20.x]
+        node-version: ['20.x', '22.x']
 
     steps:
       - name: Checkout code

package.json

@@ -43,7 +43,7 @@
     "typescript": "^5.3.3"
   },
   "engines": {
-    "node": ">=16.0.0"
+    "node": ">=20.0.0"
   },
   "gypfile": true
 }