retail-onboard-table

Walk a NEW raw retail table across the FIRST readiness transition - — Source Ready (Stage 1) through Mapping Ready (Stage 2) - — and seed its per-table readiness-status, in the Seshat BI repo. Use when someone says "onboard <schema>.<table>", "take this new table from nothing to a reviewed map", or "start the readiness journey for a table". This is the stage-transition FRONT DOOR: it sequences profile -> map ->…