Not approved and not implemented. Frontmatter status says so, the body says so
twice, and the one scope-direction call in it is named as the operator's.
ROADMAP's U7 row is sections, rail, filters, grid keyboard. The measurement
recorded in persistent-memory.d/2026-09-22-u7-remeasured-before-scoping.md
kills the first component -- zero of eleven gallery booths have a subdirectory,
and the only two booths that do are reports -- and supplies a replacement:
stripping a trailing digit-run from the filename stem yields 5 to 16 sensible
groups on four of the five large galleries.
The degenerate fifth is carried as a first-class case rather than an edge: one
group must render NO rail, because a navigation affordance that cannot navigate
is worse than none.
Closes ROADMAP's outstanding U7 ordering question: groups order by the position
of their first member in sorted(rel), so the rail reads in the same direction
as the grid. Grouping and filtering are views and never reorder -- INV-2 exists
because sorting by (group, rel) looks right and silently changes what 'the
third one' means, which is the misfiled-judgment failure invariant 6 was
written for.
Blast radius checked before writing: Item gains one field beside the existing
section, build_gallery carries it, and image_chain is explicitly unchanged.
vh
b50f41bb36