I see this as a pretty classic Return on investment question. You do not need to swale in order to capture water, at this time. You are not talking about planting
trees that would interfere with swale placement at a later time. You have a desire for a hoop house compatible layout, and your contour lines would not produce swales on contour that would work with a hoop house.
So putting in swales would involve a fair bit of work, first just figuring out the contour and then getting them dug - and they would not fit in your hoop house. Lots of work to produce a result that is not really what you want.
Or do a couple of beds oriented without much regard to contour that will fit under a hoop house. Less work and you can do what you want now.
I certainly don't see any compelling argument for swales at this time, rather than the other option you suggested. The one thing I might suggest is not to rely on compost on top of paper without doing some decompaction work on the ground beneath the beds. My choice has been to double dig, once. Breaks up the soil down to about two feet, turns the grass under and from then on stay off of them and don't turn any more.Putting down your paper or
cardboard and mulch over that would give your plants a good combination and plenty of loose soil to stretch out in.