Add prepare script to build on install

Adds a prepare script that runs tsc automatically after pnpm install.
This ensures the dist/ folder is built before any workspace dependencies
try to import from the package, fixing CI build errors.

The prepare script runs automatically during:
- pnpm install (in CI and locally)
- Before publishing to npm

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

Co-Authored-By: Claude <[email protected]>

Author: mikolalysenko

package.json

@@ -31,6 +31,7 @@
     }
   },
   "scripts": {
+    "prepare": "tsc",
     "build": "tsc",
     "dev": "tsc --watch",
     "patch": "node dist/cli.js",