U7 — plans which promoted custom columns MAY be RECLAIMED (dropped) because the source stopped sending
them. PURE, triple-gated, default-safe: returns [] unless the deployment opted in
(ReclaimVanishedColumns) AND a full sync was observed (FullSyncCompleted); and even then, only a
column that is BOTH all-NULL across that full sync AND vanished from the source is a candidate. The
engine only PLANS — MJC/RSU performs the destructive DROP, symmetric to how planPromotions plans
the ADD and the orchestrator executes it. Deterministic (sorted by column name).
U7 — plans which promoted custom columns MAY be RECLAIMED (dropped) because the source stopped sending them. PURE, triple-gated, default-safe: returns [] unless the deployment opted in (
ReclaimVanishedColumns) AND a full sync was observed (FullSyncCompleted); and even then, only a column that is BOTH all-NULL across that full sync AND vanished from the source is a candidate. The engine only PLANS — MJC/RSU performs the destructive DROP, symmetric to how planPromotions plans the ADD and the orchestrator executes it. Deterministic (sorted by column name).