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perf(gen): stitch slice relationship loaders in O(N+M) via a map

Generated <Parent>Slice.Load<Relationship> loaders matched parents and
children with an O(N*M) nested loop. Build a map keyed by the join column
and stitch in O(N+M). Falls back to the nested loop for composite keys and
types not comparable with ==. nullable keys skip NULL rows; to-one keeps
the first match (matches the previous break).