- Create email_ingestion_queue table with UNIQUE email_id constraint - Create pending_vehicle_associations table with documents FK - Seed 3 email templates: receipt_processed, receipt_failed, receipt_pending_vehicle - Add TypeScript types for queue records, associations, and Resend webhook payloads - Register email-ingestion in migration runner order Co-Authored-By: Claude Opus 4.6 <[email protected]>