I found help on the wiki and discovered I can check if a room is valid with the command "/debug rooms hi". I did so and the room is indeed valid, which is a relief because that's all I really wanted to be certain of.
Also, after placing torches in the shed and viewing it at night, it seems that light naturally leaks through the gate/door block. I guess this is normal and Vintage Story just handles light/shading differently than I'm used to.
Wiki source that helped me, in case anyone else is interested:
https://wiki.vintagestory.at/index.php/Room/en
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