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Complete implementation of Phase 1 foundation for n8n API integration tests. Establishes core utilities, fixtures, and infrastructure for testing all 17 n8n API handlers against real n8n instance. Changes: - Add integration test environment configuration to .env.example - Create comprehensive test utilities infrastructure: * credentials.ts: Environment-aware credential management (local .env vs CI secrets) * n8n-client.ts: Singleton API client wrapper with health checks * test-context.ts: Resource tracking and automatic cleanup * cleanup-helpers.ts: Multi-level cleanup strategies (orphaned, age-based, tag-based) * fixtures.ts: 6 pre-built workflow templates (webhook, HTTP, multi-node, error handling, AI, expressions) * factories.ts: Dynamic node/workflow builders with 15+ factory functions * webhook-workflows.ts: Webhook workflow configs and setup instructions - Add npm scripts: * test:integration:n8n: Run n8n API integration tests * test:cleanup:orphans: Clean up orphaned test resources - Create cleanup script for CI/manual use Documentation: - Add comprehensive integration testing plan (550 lines) - Add Phase 1 completion summary with lessons learned Key Features: - Automatic credential detection (CI vs local) - Multi-level cleanup (test, suite, CI, orphan) - 6 workflow fixtures covering common scenarios - 15+ factory functions for dynamic test data - Support for 4 HTTP methods (GET, POST, PUT, DELETE) via pre-activated webhook workflows - TypeScript-first with full type safety - Comprehensive error handling with helpful messages Total: ~1,520 lines of production-ready code + 650 lines of documentation Ready for Phase 2: Workflow creation tests 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>