Add integration testing guide and prompts

- docs/workflow/INTEGRATION-TESTING.md - Full guide on integration testing
  - What it is vs unit/e2e tests
  - 5 principles to test per integration point
  - Folder structure suggestions
  - Self-improving loop for human findings
- integration-tests/ - Template for project's integration tests
  - README.md - What to test (Feynman fills per project)
  - package.json - Test runner setup
  - scripts/setup.sh - Service startup
  - scripts/teardown.sh - Cleanup
- docs/workflow/WORKFLOW.md - Added integration testing references
- docs/workflow/AGENT-PROMPTS.md - Added integration testing prompts
- docs/workflow/INDEX.md - Updated file structure

integration-tests/scripts/setup.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+#
+# Setup script for integration tests
+# Run this before tests to start required services
+#
+# Edit this file to match your project's needs.
+#
+
+echo "=========================================="
+echo "Integration Tests Setup"
+echo "=========================================="
+echo ""
+
+# TODO: Add commands to start services
+# Example:
+#   echo "Starting backend server..."
+#   cd ../backend && pnpm start &
+#   sleep 5
+#
+#   echo "Starting database..."
+#   docker compose up -d db
+
+echo "Setup complete. Services should be running."
+echo ""
+echo "Run tests with: pnpm test"
+echo ""