The snapshot of a released API was a manual step, and v0.1.37 shipped API 1.1.0
without one, so nothing checked the APIs added in 1.1. Each version also added a
full copy of wit/.
- tests/api/released/ holds the latest released WIT (now 1.1.0) and replaces the
per-version folders: each snapshot passed the check against the one before,
so the latest covers every release.
- api_frozen.rs: under the released version wit/ must match the snapshot
exactly; additions need a version bump. Before, a function added to a
released version passed, and components built from it didn't link in that
release's IDE.
- release.yml: create-release fails when the wit/ version differs from the
snapshot's, naming the folder to copy wit/ into.
