Revert "Adding some wiring to allow the Ink app to warn if there are local development changes that haven't been captured in the recent build of the Gemini CLI."

This reverts commit 1bfc62dcc2.

packages/cli/package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "main": "dist/gemini.js",
   "scripts": {
-    "build": "tsc && touch dist/.last_build",
+    "build": "tsc",
     "start": "node dist/gemini.js",
     "debug": "node --inspect-brk dist/gemini.js",
     "lint": "eslint . --ext .ts,.tsx",