feat: add TypeScript configuration for core package

- Added tsconfig.json with ES2022 target and NodeNext module resolution
- Configured strict mode and proper file inclusion patterns
- Enables TypeScript compilation for client modules

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

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

packages/core/tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true
+  },
+  "include": [
+    "client/**/*.ts",
+    "client/**/*.d.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "dist",
+    "**/*.js"
+  ]
+}