Retracted: Pre-launch artifacts. The project hadn't shipped publicly when the v1 line was tagged; it was a misstep that committed us to v1+ semver before we wanted that promise, so we rebaselined on the v0.x.y line. The module proxy caches those tags permanently and honors retractions only from the highest version's go.mod, so v1.6.1 is a tombstone release that carries this block and retracts itself -- that pushes @latest back to the v0.x line. None of these are supported; do not pin to them.