Matrix View now defaults to a generation-by-generation pyramid (root + 3
generations of position cards, empty placements shown as dashed open
slots). Clicking a position re-roots the pyramid there; a breadcrumb
navigates back up. The collapsible list stays behind a toggle. Tree
payload now carries explicit left/right children so an only-child lands
on the correct side.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
martbost
1e2b03c795
