Sub-ticket of PLUTO-217 Soporte parity P1: DDL — supportTicketMessages table + vSupportTicketMessages view + archive trigger; add to supportTickets: ticketNumber(sequential), assignedAgent, urlPath, urlSearchParams, userAgent, resolvedAt, resolutionNote; backfill ticketNumber (NOT-NULL/default vs archive-fn to_jsonb expand-only trap). Audit pre-apply review gates APPLY. · pluto