chore: add LSP readiness check script

Add diagnostic script to verify TypeScript LSP integration is ready to test.

The script checks:
- LSP infrastructure is enabled
- Extension is registered
- Extension files exist
- typescript-language-server is installed and executable
- Path resolution is correct
- All components can be found

Usage: node check-lsp-ready.js

This helps quickly verify everything is set up correctly before
attempting to test in the browser.

Author: claude

check-lsp-ready.js

@@ -0,0 +1,92 @@
+#!/usr/bin/env node
+/**
+ * Quick check script to verify TypeScript LSP is ready
+ * Run: node check-lsp-ready.js
+ */
+
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+console.log('╔════════════════════════════════════════════════════════════╗');
+console.log('║  TypeScript LSP Integration - Readiness Check              ║');
+console.log('╚════════════════════════════════════════════════════════════╝\n');
+
+let allGood = true;
+
+// Check 1: LSP Infrastructure Enabled
+console.log('1. LSP Infrastructure');
+const clientLoaderPath = './src/languageTools/ClientLoader.js';
+const clientLoaderContent = fs.readFileSync(clientLoaderPath, 'utf8');
+const lspEnabled = clientLoaderContent.includes('initDomainAndHandleNodeCrash();') &&
+                    !clientLoaderContent.includes('//initDomainAndHandleNodeCrash();');
+console.log('   Status:', lspEnabled ? '✓ Enabled' : '✗ Disabled');
+if (!lspEnabled) allGood = false;
+
+// Check 2: Extension Registered
+console.log('\n2. TypeScriptLanguageServer Extension');
+const extensionsPath = './src/extensions/default/DefaultExtensions.json';
+const extensionsContent = fs.readFileSync(extensionsPath, 'utf8');
+const registered = extensionsContent.includes('"TypeScriptLanguageServer"');
+console.log('   Registered:', registered ? '✓ Yes' : '✗ No');
+if (!registered) allGood = false;
+
+// Check 3: Extension Files
+console.log('\n3. Extension Files');
+const mainJs = './src/extensions/default/TypeScriptLanguageServer/main.js';
+const clientJs = './src/extensions/default/TypeScriptLanguageServer/client.js';
+console.log('   main.js:', fs.existsSync(mainJs) ? '✓ Exists' : '✗ Missing');
+console.log('   client.js:', fs.existsSync(clientJs) ? '✓ Exists' : '✗ Missing');
+if (!fs.existsSync(mainJs) || !fs.existsSync(clientJs)) allGood = false;
+
+// Check 4: TypeScript Language Server
+console.log('\n4. TypeScript Language Server');
+const serverPath = './node_modules/.bin/typescript-language-server';
+const serverExists = fs.existsSync(serverPath);
+console.log('   Installed:', serverExists ? '✓ Yes' : '✗ No');
+
+if (serverExists) {
+    try {
+        const version = execSync(serverPath + ' --version', { encoding: 'utf8' }).trim();
+        console.log('   Version:', version);
+    } catch (err) {
+        console.log('   Version: ✗ Cannot execute');
+        allGood = false;
+    }
+} else {
+    allGood = false;
+}
+
+// Check 5: Client Path Resolution
+console.log('\n5. Path Resolution in client.js');
+const clientContent = fs.readFileSync(clientJs, 'utf8');
+const hasCorrectPath = clientContent.includes('../../../../node_modules/.bin/typescript-language-server');
+console.log('   Path:', hasCorrectPath ? '✓ Correct (4 levels up)' : '✗ Wrong');
+if (!hasCorrectPath) allGood = false;
+
+// Check 6: Simulate Path Resolution
+console.log('\n6. Path Resolution Test');
+const clientDir = path.dirname(path.resolve(clientJs));
+const resolvedPath = path.resolve(clientDir, '../../../../node_modules/.bin/typescript-language-server');
+const pathCorrect = fs.existsSync(resolvedPath);
+console.log('   From:', clientDir);
+console.log('   To:', resolvedPath);
+console.log('   Valid:', pathCorrect ? '✓ Yes' : '✗ No');
+if (!pathCorrect) allGood = false;
+
+// Summary
+console.log('\n' + '═'.repeat(60));
+if (allGood) {
+    console.log('✓✓✓ ALL CHECKS PASSED ✓✓✓');
+    console.log('\nTypeScript LSP is ready! To test:');
+    console.log('  1. npm run serve');
+    console.log('  2. Open http://localhost:8000/src in browser');
+    console.log('  3. Check browser console for initialization messages');
+    console.log('  4. Open a .js file and test code completion');
+} else {
+    console.log('✗✗✗ SOME CHECKS FAILED ✗✗✗');
+    console.log('\nPlease fix the issues above before testing.');
+}
+console.log('═'.repeat(60));
+
+process.exit(allGood ? 0 : 1);