In the DraftCXU data model, `parent_assumption_ids` is a list so that assumptions can reference parent assumptions for lineage or dependency tracking.

parent_assumption_ids: list

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

DraftCXU:

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

parent_assumption_ids

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md