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New lib/datalog/builtins.sx: (< <= > >= = !=) and (is X expr) with + - * /. dl-eval-arith recursively evaluates nested compounds. Safety analysis now walks body left-to-right tracking the bound set: comparisons require all args bound, is RHS vars must be bound (LHS becomes bound), = special-cases the var/non-var combos. db.sx keeps the simple safety check as a forward-reference fallback; builtins.sx redefines dl-rule-check-safety to the comprehensive version. eval.sx dispatches built-ins through dl-eval-builtin instead of erroring. 19 new tests.