Size charts the brand may pick from in the "select size chart" UI — guides in folders the manufacturer assigned to this brand (including subfolders of assigned folders). Ungrouped / unassigned guides are hidden. Returns an empty list when the brand has no manufacturer link.

Guides still being extracted (or whose extraction failed) are included with their extraction_status so the picker can show them disabled — only "ready" guides carry a table, and applying one that isn't ready is rejected.