retail-build-warehouse

Author the silver + gold migration SQL for a mapped retail table from its APPROVED source-map, then STOP before executing. Use after a table's mapping gate is CLEARED in the Seshat BI repo and someone asks to build the silver/gold SQL, write the migration, or fill the retail-orchestrate build seam. Author-and-stop: it writes warehouse/migrations/*.sql FILES only, never connects to a database, never applies the SQL,…