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- pl-eval-arith: add floor, ceiling, truncate, round, sqrt, sign, pow, integer, float, float_integer_part, float_fractional_part, **, ^ operators - pl-collect-vars: helper that extracts unbound variables from a term (left-to-right, deduplicated by var id) - term_variables/2: dispatches via pl-collect-vars, unifies second arg with var list - pl-predsort-insert!: inserts one element into a sorted list using a 3-arg comparator predicate; deduplicates elements where comparator returns '=' - pl-predsort-build!: builds sorted list via fold over pl-predsort-insert! - predsort/3: full ISO predsort — sorts and deduplicates a list using a caller-supplied predicate - lib/prolog/tests/advanced.sx: 21 tests (12 arith, 5 term_variables, 4 predsort) - conformance.sh: add advanced suite - scoreboard: 517/517 (was 496/496) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>