Brummel
be8d267019
The SweepError type-level rustdoc still read "A structural fault constructing a `GridSpace`" though the enum now also gates `RandomSpace::new` (the three random-only variants are each documented individually, but the type summary was stale). Broaden it to name both spaces and group the grid vs. random faults. Doc-only, behaviour-preserving — the same low-grade doc-debt class the 0049 audit fixed inline for the module doc. Surfaced by the cycle-0049 fieldtest. refs #52