Squash of Darkwing's 176a6bf4b..df65a3d4c on origin/darkwing/row190-r3,
the 25 manifest paths, build-r3.patch efe898c2, manifest cc0ea9e8
(Filbert approve round 3, comment 29713). Design revision 3 in
agents/darkwing/work/queue-190/DESIGN.md. Gate on base d0bbc5c1c with
the patch: 15 package suites 2664 pass 0 fail, 10 scripts/test-*.sh
suites 429 pass 0 fail (plus 156 node tests in the queue suite).
Refactor moved to 99a406ed3 since, a window record touching no manifest
path. Mutants 20 of 20 killed (BUILD.md, round 3). No live change: the
stack runs from copy 4429a104f until a re-pin.
