Create 3 missing service READMEs (api_gateway, data_acquisition_service, trading_agent_service). Create bin/fxt/README.md. Create testing/service-integration/README.md. Update existing service and testing READMEs to standard template. Delete 4 subdirectory READMEs from testing/integration/ and testing/e2e/. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>