fix version set for cli and slash commands (#892)

esbuild.config.js

@@ -5,6 +5,9 @@
  */
 
 import esbuild from 'esbuild';
+import { readFileSync } from 'fs';
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'));
 
 esbuild
   .build({
@@ -13,6 +16,9 @@ esbuild
     outfile: 'bundle/gemini.js',
     platform: 'node',
     format: 'esm',
+    define: {
+      'process.env.CLI_VERSION': JSON.stringify(pkg.version),
+    },
     banner: {
       js: `import { createRequire } from 'module'; const require = createRequire(import.meta.url); globalThis.__filename = require('url').fileURLToPath(import.meta.url); globalThis.__dirname = require('path').dirname(globalThis.__filename);`,
     },