bump bun to 1.3.4

package.json

@@ -4,7 +4,7 @@
   "description": "AI-powered development tool",
   "private": true,
   "type": "module",
-  "packageManager": "[email protected].3",
+  "packageManager": "[email protected].4",
   "scripts": {
     "dev": "bun run --cwd packages/opencode --conditions=browser src/index.ts",
     "typecheck": "bun turbo typecheck",