chore: migrate to @typescript/native-preview (tsgo)

packages/core/package.json

@@ -17,7 +17,7 @@
     "test": "vitest run",
     "test:ci": "vitest run",
     "posttest": "npm run build",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsgo --noEmit"
   },
   "files": [
     "dist"
@@ -106,9 +106,9 @@
     "@types/js-yaml": "^4.0.9",
     "@types/json-stable-stringify": "^1.1.0",
     "@types/picomatch": "^4.0.1",
+    "@typescript/native-preview": "^7.0.0-dev.20260412.1",
     "chrome-devtools-mcp": "^0.19.0",
     "msw": "^2.3.4",
-    "typescript": "^5.3.3",
     "vitest": "^3.1.1"
   },
   "engines": {

packages/core/tsconfig.json

@@ -5,8 +5,8 @@
     "lib": ["DOM", "DOM.Iterable", "ES2023"],
     "composite": true,
     "types": ["node", "vitest/globals"],
-    "baseUrl": ".",
     "paths": {
+      "*": ["./*"],
       "@google/gemini-cli-core": ["./index.ts"]
     }
   },