giles
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The previous fd-fire-store fired every constraint exactly once. That left the propagation incomplete in chains like fd-plus c4 1 a; fd-neq c3 a where, on the round c4 binds, fd-plus binds a, but fd-neq c3 a was already past — so the conflict went undetected. New: fd-store-signature is sum-of-domain-sizes + count-of-bindings. fd-fire-store calls fd-fire-list and recurses while the signature strictly decreases. Reaches a fixed point or fails. This makes N-queens via FD tractable: 4-queens -> ((2 4 1 3) (3 1 4 2)) — exactly the two solutions. 5-queens -> 10 solutions (the canonical count), in seconds. Phase 6 marked complete in the plan: domains, fd-in, fd-eq, fd-neq, fd-lt, fd-lte, fd-plus, fd-times, fd-distinct, fd-label, all wired through the constraint-reactivation loop. Two new tests, 626/626 cumulative.