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Report attributes (:attrs) project to attr(Id, name) facts; policy gains (:attr x) and (:not <cond>) conditions. The Prolog substrate exposes negation as a functor not(Goal) (the prefix \+ operator doesn't parse here). Closed-world example: hide spam unless author verified. Default policy untouched — feature proven via custom rule sets, so all 132 base tests stay green. +14 extension tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>