Rewrite the feature files for the artifact model

Delete the legacy trip/payment/document model and instructor

Cut the pipeline, dashboard and UI over to MediaArtifacts

Add Gherkin feature specs for editable tables, accumulation, and background processing

Drop voice LoRA scope; document vision fine-tune path

Strengthen acceptance tests through orchestrator (B7)

Wire payment reconciliation into CRM card with profit (A3)

Merge audio transcriptions into timeline (A2)

Add Viva Mais AI build spec and Phase 0 harness