It worked after I did `setenforce 0`, so SELinux is the problem. I have my swap file inside its own BTRFS subvolume mounted at /swap and the SELinux context for that directory is system_u:object_r:unlabeled_t:s0. It looks like I need to allow systemd-sleep to search that directory. I think the proper way to do that is to create a new type, label /swap with that type, and add a policy rule that allows systemd_sleep_t to search that type. I don't know enough about SELinux to do that though.
Turns out all I needed to do is restorecon -v /swap, which relabeled /swap to system_u:object_r:default_t:s0 and that made hibernation work. Thanks for the help pointing me to the documentation.
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