Add basic non blocking CI workflow. (#21)

package.json

@@ -9,8 +9,9 @@
   "scripts": {
     "build": "npm run build --workspaces",
     "test": "npm run test --workspaces",
+    "lint": "eslint . --ext .ts,.tsx",
+    "typecheck": "tsc --noEmit --jsx react",
     "start": "node ./scripts/check-build-status.js && npm run start --workspace=gemini-code-cli -- \"$@\"",
-    "lint": "eslint .",
     "format": "prettier --write ."
   },
   "devDependencies": {