Remove zod resolution and bump version to 1.2.0

- Removed zod version resolution from package.json
- Bumped version from 1.1.5 to 1.2.0

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

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@anthropic-ai/mcpb",
   "description": "Tools for building MCP Bundles",
-  "version": "1.1.5",
+  "version": "1.2.0",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",