Layer 4
How it's built
A look under the hood: the building blocks, how they fit together, and the checks we run to keep each promise honest.
The feature map, laid out like a periodic table
Nestkite is mapped as 580 feature stems grouped into 19 domains and six layers, and some of those stems are marked as gaps. Search it, filter it, or pick a tile to see what it connects to.
The feature table loads when this section comes into view.
Fidelity notebook
Small things we noticed in the official practice software, and whether we copied them, are in the fidelity notebook on the proof page.
Proof wall
What we measured about the practice engine, with every number traced to a script that can be run again, is on the proof page.