Add update-check command

tools/installer/bin/bmad.js

@@ -6,13 +6,17 @@ const fs = require('fs').promises;
 const yaml = require('js-yaml');
 const chalk = require('chalk');
 const inquirer = require('inquirer');
+const semver = require('semver');
+const https = require('https');
 
 // Handle both execution contexts (from root via npx or from installer directory)
 let version;
 let installer;
+let packageName;
 try {
   // Try installer context first (when run from tools/installer/)
   version = require('../package.json').version;
+  packageName = require('../package.json').name;
   installer = require('../lib/installer');
 } catch (e) {
   // Fall back to root context (when run via npx from GitHub)
@@ -86,6 +90,56 @@ program
     }
   });
 
+// Command to check if updates are available
+program
+  .command('update-check')
+  .description('Check for BMad Update')
+  .action(async () => {
+    console.log('Checking for updates...');
+    
+    // Make HTTP request to npm registry for latest version info
+    const req = https.get(`https://registry.npmjs.org/${packageName}/latest`, res => {
+      // Check for HTTP errors (non-200 status codes)
+      if (res.statusCode !== 200) {
+        console.error(chalk.red(`Update check failed: Received status code ${res.statusCode}`));
+        return;
+      }
+      
+      // Accumulate response data chunks
+      let data = '';
+      res.on('data', chunk => data += chunk);
+      
+      // Process complete response
+      res.on('end', () => {
+        try {
+          // Parse npm registry response and extract version
+          const latest = JSON.parse(data).version;
+          
+          // Compare versions using semver
+          if (semver.gt(latest, version)) {
+            console.log(`${packageName} update available: ${version} → ${latest}`);
+          } else {
+            console.log(`${packageName} is up to date.`);
+          }
+        } catch (error) {
+          // Handle JSON parsing errors
+          console.error(chalk.red('Failed to parse npm registry data:'), error.message);
+        }
+      });
+    });
+    
+    // Handle network/connection errors
+    req.on('error', error => {
+      console.error(chalk.red('Update check failed:'), error.message);
+    });
+    
+    // Set 30 second timeout to prevent hanging
+    req.setTimeout(30000, () => {
+      req.destroy();
+      console.error(chalk.red('Update check timed out'));
+    });
+  });
+
 program
   .command('list:expansions')
   .description('List available expansion packs')