tool/authorkey_bench.dart times on the VM and compiled to JavaScript the
generation of an author key, its Ed25519 signature of 99 bytes and of
1 MiB, the strict verification for comparison, its file encrypted with
scrypt of logN 16 and read again, sealLocator for round 1000 and
newEnvelope of a .dkc of 1 MiB.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
