This is a basic attempt at the Vandagyre logic, but also things like
"Maraquan items released before the Maraquan X was released"!
I also added a new task, `rails items:update_cached_fields`, which needs
to be run after this change, because it affects the value of
`Item#predicted_fully_modeled?`.
Eyeballing the updated search results for `-is:modeled`, this feels
pretty close? I'm guessing it's not perfect (e.g. maybe a pet type we
got modeled late into its existence, or some items that just never did
fit a certain pet), but feels pretty good.
I also know we had the "modeling hints" override in Impress 2020, which
we aren't reading yet. We should probably take that into account here
too!
As I'm writing out my solution for this, I'm almost wondering if it's
time for the refactor I've been Theoretically Planning Someday, to move
items to a real `ItemAppearance` model in the database similar to
`PetState`… Hmm hmm hmm…
For now though, I'm taking a break!
I forget, there was some tricky debugging about getting the fixtures
right, I think the previous commit doesn't *actually* pass from a clean
setting. Ah well, looks good now!
