Get Statement By Name

Returns the first statement on `inSubject` whose predicate's local name matches `byName`, or undefined when no match exists. Used by the universal renderer's tabular emission to look up a row's statement for a given column when the column predicate is loop-bound. Matches by local name only — predicates from different packages with the same local name collide; safe inside a single subject's statement set where the local-name namespace is well-defined.