source-mapping

Drive a raw retail source table through the source-mapping gate before any silver SQL exists. Use when someone asks to map, model, profile, or onboard a new bronze table toward Power BI in the Seshat BI repo - — profile the source, decide grain/PK, fill the five mapping artifacts into mappings/<table>/, and stop at the gate. This skill ENFORCES the rule that no silver.* SQL is written until the map is reviewed and…