c8. QGUIkit Cleanup

Mark, 2026-11-12, in the design c140 session, verbatim:

Do this task here: “QGUIkit cleanup in qnative (after the merge)”

The task is design c140's ruling D14: one qnative cycle carries the code rulings D2, D13, D9, D8 and D5, in that order, with a review stop after D13 and one at the end. The brief is ../design/cycles/c140.surface-evaluation/handon-qnative.md; the rulings are in ../design/cycles/c140.surface-evaluation/review-1.md § Ruled; the evidence is at /cycles/design/c140/scorecard on the design site.

Before it started, Mark ruled the order with the merge (same session): "Merge c7, then clean up". main was fast-forwarded to c7 Web Rail's head (900578f, PR qpoint-io/qnative#1), unpushed.