store.fga.yaml and run fga model test --tests store.fga.yaml, or load it with fga store import --file store.fga.yaml. Paste takes one from the clipboard and Import reads one from disk, as does dropping a file here; either opens it in the Playground, so a lesson is never overwritten.
fga model get returns once fga model write --file fga.mod has compiled the modules into one schema 1.2 model. The comments record where each part came from.
fga model transform prints and what the WriteAuthorizationModel API accepts.