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dl-find-bindings now uses dl-fb-aux lits db subst i n (indexed iteration via nth) instead of recursive (rest lits). Eliminates O(N²) list-copy per body of length N. chain-15 saturation 25s → 16s; chain-25 finishes in 33s real (vs. timeout previously). Bumped semi_naive tests to chain-10 differential + chain-15 semi-only count (was chain-5/chain-5). Blocker entry refreshed.