Start a named draw group from an empty hold, and state the decision's goal and cost exactly

todo.md

@@ -300,9 +300,6 @@ because pairing a street with its exact postnummer rewrites shipped rows.
   flag, an exit code, an exported name, a fence, a builtin and the lowest Go.
 - Measure the allocation gate over the shipped `geo` trees too: `pinSet.inline [8]` is sized
   for them, and `perf_test.go` checks a synthetic five-deep tree only.
-- Make a named draw group's hold lazy, `&hold{}` in `renderScope.hold`: it escapes
-  to the heap anyway, so its two eager maps buy no stack and cost two allocations per
-  group that may never read through them. Check it against the alloc tests.
 - Name goal 2's four criteria with the axes the panel scores, so a recorded score maps
   back to the clause it came from: the goal spells them out in prose while `todo.md`
   records `Navigation`, `Locality`, `Shape` and `Self-sufficiency`.