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1e79fc8 dsu_rollback is correct by replay (300 trials x 60 ops, 0 mismatches on find/size/connected/components) and its 10 cells are collected (218 -> 228, tree_root's six still uncollected so Q90 stands, five of six mutants die), but the union-by-size claim is graded by no cell (M-SIZE: drop the size comparison -> Ran 10 tests OK, rc 0), test_no_path_compression_find_stable passes under a compressing find because its own 3-node construction is already flat, and find(-1) returns 3 while union(-1,0) merges index 3; gate unchanged at 8 legs 6 pass 2 fault (path-claims 3956/32/2, selftest-sweep rc 1 printing '22 OK, 0 fatal'), visibility 22nd identical reading, nothing from inbox quoted; my own Q90 addendum landed inside Q93's section and is named rather than moved