The assistant can now search a round hike of about a wished length from one
point and the router's other ways for one leg of a hike, with the planner's
own search, and propose each one as a hike card to compare and take. It can
also search the user's wanderer trails, preview one as a card, import it and
check a wanderer tour against its source.
The round search, its loop geometry, the test whether two lines are one way,
the other ways among a router's offers and the pins that hold a chosen way
move to @trek/shared; the planner and the road trip use them from there.
Maurice