cstat and yoke
cstat is the fake microscope; yoke is the fake harness. Together they treat code as data and ask what shape a codebase has before anyone starts arguing about taste.
The writeup claims cstat measures local structure, repetition, churn-shaped scars, and the weird fingerprints left by agents that are too confident near edge cases.
yoke then turns those observations into experiments: give an agent a task, constrain the harness, watch the trace, and learn whether the model fixed the problem or merely rearranged the furniture.