giles
f2817bb6be
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fd-in x dom-list: narrows x's domain. If x is a ground number, checks membership; if x is a logic var, intersects existing domain (or sets fresh) and stores via fd-set-domain. Fails if domain becomes empty. fd-label vars: drives search by enumerating each var's domain. Each var is unified with each value in its domain, in order, via mk-mplus of singleton streams. Forward: (fd-in x dom) (fd-label (list x)) iterates x over dom. Intersection: two fd-in goals on the same var compose via dom-intersect. Disjoint domains -> empty answer set. Ground value membership check gates pass/fail. Composes with the rest of the miniKanren machinery — fresh / conde / membero etc. all work alongside. 9 new tests, 586/586 cumulative.