11-node workflow: Webhook → Input Mapper → Clean & Validate → Validation Router branches to Dead Letter (422) or Test Mode Check → Mock Enrichment / Apollo HTTP Request → Enrichment Mapper & Grader → Success Response (200). Both live and mock paths converge on Success Response. JSON validated parseable and structurally correct. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>