feat: Add Zod 3 to 4 migration workflow

codemods/zod/3/zod-3-4/.gitignore

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+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build artifacts
+target/
+dist/
+build/
+
+# Temporary files
+*.tmp
+*.temp
+.cache/
+
+# Environment files
+.env
+.env.local
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Package bundles
+*.tar.gz
+*.tgz 

codemods/zod/3/zod-3-4/README.md

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+# zod-3-4
+
+Helps migrate Zod 3 to Zod 4.
+
+## Installation
+
+```bash
+# Install from registry
+codemod run zod-3-4
+
+# Or run locally
+codemod run -w workflow.yaml
+```
+
+## Usage
+
+This codemod transforms javascript code by:
+
+- Converting `var` declarations to `const`/`let`
+- Removing debug statements
+- Modernizing syntax patterns
+
+## Development
+
+```bash
+# Test the transformation
+npm test
+
+# Validate the workflow
+codemod validate -w workflow.yaml
+
+# Publish to registry
+codemod login
+codemod publish
+```
+
+## License
+
+MIT 

codemods/zod/3/zod-3-4/codemod.yaml

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+schema_version: "1.0"
+name: "zod-3-4"
+version: "0.1.0"
+description: "Helps migrate Zod 3 to Zod 4."
+author: "hello@codemod.com"
+license: "MIT"
+workflow: "workflow.yaml"
+category: "migration"
+
+targets:
+  languages: ["javascript"]
+
+keywords: ["transformation", "migration"]
+
+registry:
+  access: "public"
+  visibility: "public"

codemods/zod/3/zod-3-4/package.json

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+{
+  "name": "zod-3-4",
+  "version": "0.1.0",
+  "description": "Helps migrate Zod 3 to Zod 4.",
+  "type": "module",
+  "dependencies": {
+    "@ast-grep/cli": "^0.15.0",
+    "@ast-grep/napi": "^0.15.0"
+  },
+  "devDependencies": {
+    "@codemod.com/jssg-types": "^1.0.3"
+  },
+  "scripts": {
+    "test": "node tests/test.js",
+    "apply": "node scripts/apply-codemod.js"
+  }
+}