giles
c01ddc2b23
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Three more constraint goals built on the same propagator-store machinery as fd-neq: fd-lt: x < y. Ground/ground compares; var/num filters domain; var/var narrows x's domain to (< y-max) and y's to (> x-min). fd-lte: ≤ variant. fd-eq: x = y. Ground/ground checks. Var/num: requires num to be in var's domain (or var unconstrained) before binding. Var/var: intersect domains, narrow both, then unify the vars. 10 new tests: narrowing against ground, ordered-pair generation, chained x<y<z determinism, domain-sharing, out-of-domain rejection. 603/603 cumulative (100/100 across the four CLP(FD) test files).