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Captures the work left on the shelf after the loops/minikanren squash
merge:
Piece A — Phase 7 SLG (cyclic patho, mutual recursion). The hardest
piece; the brief's "research-grade complexity" caveat
still stands. Plan documents the in-progress sentinel +
answer-accumulator + fixed-point-driver design.
Piece B — Phase 6 polish: bounds-consistency for fd-plus / fd-times
in the (var var var) case. Math is straightforward
interval reasoning; low risk, self-contained.
Piece C — =/= disequality with a constraint store. Generalises
nafc / fd-neq to logic terms via a pending-disequality
list re-checked after each ==.
Piece D — Bigger CLP(FD) demos: send-more-money and Sudoku 4x4.
Both validate Piece B once it lands.
Suggested ordering: B (low risk, unlocks D) → D (concrete validation)
→ C (independent track) → A (highest risk, do last).
Operating ground rules carried over from the original loop brief:
loops/minikanren branch, sx-tree MCP only, one feature per commit,
test count must monotonically grow.