Filters change what is visible. They never change what the registry contains — a stage always admits every compatible candidate, and the count above says how many are hidden.

Columns are the sub-steps a route actually chooses between, grouped under the stage they belong to, and they never move. Every edge joins adjacent stages only — there is no force layout, no backward edge and no diagonal across stages, because the picture has to keep saying what runs in what order. Sampling is deterministic: the same seed draws the same routes.

Complete routes are compared, not isolated candidate scores: a candidate that is strongest alone can still lose in a route whose later stages cannot verify what it produces. Highlighted cells differ from the baseline.

Ineligible candidates stay visible and say why they are blocked. Hiding them would answer "what can I pick" while quietly changing the question to "what did the current policy leave".