feat: migrate to Bun 1.3

- Migrate from npm to Bun 1.3.0
- Update Node.js engine to 22.20.0 LTS
- Update CI/CD workflow to use Bun
- Update package scripts for Bun compatibility

Author: alpha912

.github/workflows/validate-examples.yml

@@ -16,13 +16,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
         with:
-          node-version: '22'
+          bun-version: '1.3.0'
 
       - name: Install omniscript-cli
-        run: npm install -g omniscript-cli@latest
+        run: bun install -g omniscript-cli@latest
 
       - name: Validate all examples
         run: |