ci: add Node.js 24 to test matrix

Test matrix now runs on Node.js 18, 20, 22, and 24.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: exe.dev user

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [18, 20, 22]
+        node-version: [18, 20, 22, 24]
       fail-fast: false
 
     steps: