ui+ux: header epure / file preserve sur error / submit Drops / pending sobre / flush right

feat(append): auto-append on register_consolidation + guard against overwrite

fix(persistence): use cumulative registry count instead of per-turn messages

fix(registry): replace ContextVar with thread-safe global dict

fix(submission): force l'explanation produite par infer() (registry)

fix(enrich): exclusion_context utilise set(None) au lieu de reset(token)

feat(enrich): fast-path anti-doublons via ContextVar (option A)

feat(phase-11): moteur d'inférence + consolidation + soumission

feat(phase-6 + mcp): JDM enrichment pipeline + expose verify_claim via MCP