Acceptance Criteria
media-position gains cover: the media well fills the rune interior (thin-edge frame + --rf-radius-media preserved) and content overlays it; switching from top|bottom|start|end is a one-attribute change on the same content.- Cover scope (
full|header, rune-declared, override-able) bounds the overlay region; header flows the body below; content beyond the region always flows, never overlays. - Realized as a
media-position engine variant (SPEC-091) supplying the cover structure; there is no overlay primitive in the layout config. - Height authority follows external grid track → media aspect → default portrait;
cover supersedes content-height/media-ratio.
Approach
Gated on WORK-361 (card/bento-cell flat-slot migration). card.css (--rf-card-edge,--rf-radius-media). SPEC-089 §1,§4.