Mica::Testing

Test machinery shared by every Mica format. It is not loaded by require "mica"; specs and fuzz drivers require it explicitly:

require "mica/testing"

• Complexity measures a workload's operation count at two input sizes to prove it linear.
• ByteMutator and FuzzCampaign drive seeded, replayable hostile-byte fuzzing through any format.
• Traceability maps specification requirement ids to the specs that cover them.