feat(tests): implement Phase 2 integration testing - workflow creation tests

Implements comprehensive workflow creation tests against real n8n instance
with 15 test scenarios covering P0 bugs, base nodes, advanced features,
error scenarios, and edge cases.

Key Changes:
- Added 15 workflow creation test scenarios in create-workflow.test.ts
- Fixed critical MSW interference with real API calls
- Fixed environment loading priority (.env before test defaults)
- Implemented multi-level cleanup with webhook workflow preservation
- Migrated from webhook IDs to webhook URLs configuration
- Added TypeScript type safety fixes (26 errors resolved)
- Updated test names to reflect actual n8n API behavior

Bug Fixes:
- Removed MSW from integration test setup (was blocking real API calls)
- Fixed .env loading order to preserve real credentials over test defaults
- Added type guards for undefined workflow IDs
- Fixed position arrays to use proper tuple types [number, number]
- Added literal types for executionOrder and settings values

Test Coverage:
- P0: Critical bug verification (FULL vs SHORT node type format)
- P1: Base n8n nodes (webhook, HTTP, langchain, multi-node)
- P2: Advanced features (connections, settings, expressions, error handling)
- Error scenarios (documents actual n8n API validation behavior)
- Edge cases (minimal workflows, empty connections, no settings)

Technical Improvements:
- Cleanup strategy preserves pre-activated webhook workflows
- Single webhook URL accepts all HTTP methods (GET, POST, PUT, DELETE)
- Environment-aware credential loading with validation
- Comprehensive test context for resource tracking

All 15 tests passing ✅
TypeScript: 0 errors ✅

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/integration/n8n-api/test-connection.ts

@@ -0,0 +1,34 @@
+/**
+ * Quick test script to verify n8n API connection
+ */
+
+import { getN8nCredentials } from './utils/credentials';
+import { getTestN8nClient } from './utils/n8n-client';
+
+async function testConnection() {
+  try {
+    console.log('Loading credentials...');
+    const creds = getN8nCredentials();
+    console.log('Credentials loaded:', {
+      url: creds.url,
+      hasApiKey: !!creds.apiKey,
+      apiKeyLength: creds.apiKey?.length
+    });
+
+    console.log('\nCreating n8n client...');
+    const client = getTestN8nClient();
+    console.log('Client created successfully');
+
+    console.log('\nTesting health check...');
+    const health = await client.healthCheck();
+    console.log('Health check result:', health);
+
+    console.log('\n✅ Connection test passed!');
+  } catch (error) {
+    console.error('❌ Connection test failed:');
+    console.error(error);
+    process.exit(1);
+  }
+}
+
+testConnection();