Fix CI to work across all branches

- Update GitHub Actions from v2/v3 to v4 (modern versions)
- Update Node.js from 12.x to 18.x/20.x/22.x matrix testing
- Add 2025 branch to CI triggers
- Fix cross-platform test issues (replace 'cal' with 'echo')
- Add --legacy-peer-deps for dependency resolution
- Add security audit job

This ensures all branches will have working CI and tests
pass on Ubuntu environment used by GitHub Actions.

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

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

Author: hitode909

.github/workflows/ci.yml

@@ -1,28 +1,58 @@
 ---
 
 name: CI
+
 on:
   pull_request:
   push:
     branches:
       - master
+      - 2025
+
 jobs:
   test:
+    name: Test on Node.js ${{ matrix.node-version }}
     runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+    
     steps:
-      - uses: actions/checkout@v3
-      - name: Use Node.js
-        uses: actions/setup-node@v2
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
         with:
-          node-version: '12.x'
-      - uses: actions/cache@v2
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+      
+      - name: Install dependencies
+        run: npm ci --legacy-peer-deps
+      
+      - name: Run tests
+        run: npm test
+      
+      - name: Run build
+        run: npm run compile
+
+  security:
+    name: Security audit
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
         with:
-          path: ~/.npm
-          key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-npm-
-      - name: install
-        run: npm ci
-      - run: npm test
-        env:
-          CI: true
+          node-version: '20.x'
+          cache: 'npm'
+      
+      - name: Install dependencies
+        run: npm ci --legacy-peer-deps
+      
+      - name: Run security audit
+        run: npm audit --audit-level=high

src/test/Runner.test.ts

@@ -49,8 +49,8 @@ describe('Runner', () => {
       const runner = new Runner({
         retry: 3,
         config: 'backstop.json',
-        command: 'cal -y',
-        referenceCommand: 'cal',
+        command: 'echo "test"',
+        referenceCommand: 'echo "ref"',
         rootDir: resolve('backstop/failed'),
       });
       expect(await runner.run()).toEqual(true);