Default is ALL: whichever lane (or combination) is best placed picks it up and claims it — and a lane never claims without weighing whether it's the right one and won't collide with work in flight. Pick a single lane only when it must be that one.
Ideas · inert proposals
A lane proposes an evidence-linked idea; it does nothing until you approve or decline it. A dogfood of Daēnā's Ideas primitive.