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Bug: dl-eval-aggregate accepted non-variable agg-vars and non- literal goals silently, producing weird/incorrect counts: - `count(N, 5, p(X))` would compute count over the single constant 5 (always 1), ignoring p entirely. - `count(N, X, 42)` would crash with "unknown body-literal shape" at saturation time rather than at rule-add time. Fix: dl-eval-aggregate now validates up front that the second arg is a variable (the value to aggregate) and the third arg is a positive literal (the goal). Errors are descriptive and include the offending argument. 2 new aggregate tests.