Surface Grid Walk
Kind: algorithm
Record: algorithms:surface-grid-walk
Canonical: Algorithms
Closure: Dependencies in load order
Walk the dimension-by-lens grid across the catalog, mark every cell that carries a surface, and surface the empty cells as candidate gaps using the anomaly lens, so a missing aspect is detected structurally rather than by recollection.
Listed in Algorithm contracts, after Coverage Workspace and before Uncovered Gap Derivation.