Explainers

Long-form write-ups on non-obvious decisions inside the codebase.

• Eval-window leakage — the Phase-1 dump path that made pre-4daeff3 graphlet sweep rows unreliable at W ≠ 90.
• Graphlet NaN fix — why merge_graphlet_dfs switched from outer to inner join at W > trained_wl.

These pages exist to keep the why out of the git log and into the docs, where people actually read it.