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The migration 0033 stores every swap of a file as an override group. A swap made in a copy is paired with the child of the near main that holds the same position, as sync paired it; any other slot is dropped. All pairings are found on the data as it was, so swaps nested in swaps pair against the content of the outer one, and libraries pair the same whether they are migrated or not. A head that refers to its own slot only inherited it, and drops it even when its near main cannot be reached. Any other slot that matches no child, or whose near main is in a library that is not loaded, keeps the slot as its ref, so validation reports it. An import, which migrates its files before it links their libraries, leaves those slots and converts them once the libraries are linked. A migrated head that sits elsewhere than the child it replaces would place it gets its geometry marked as touched, so the first sync does not move it. Migrated and new files carry the feature components/swap-group, so a client that still writes slots cannot open them. Validation checks the new form: :misplaced-slot reports any slot, :misplaced-swap-group the group anywhere but on a nested copy head in a copy, :ref-not-in-near-main a nested copy head whose ref is not a child of the near main of its parent, and :duplicate-ref two children of a copy that refer to the same main shape. Each has a repair. Nothing but the migrations reads slots any more: the slot branches go from sync, swap, switch, reset, detach, paste, duplicate and move. The helpers that read and write a slot on a shape move to files/swap-slots, and the ones that follow refs to files/comp-processors. The graph projection drops the FillsSwapSlot edge, the components debugger shows the component a swapped head takes its content from, and the plugin API documents componentRefShape for a swapped copy. The swap tests are named after what they check. Benchmark (lower quantile, ms; baseline / now / ratio): deepest-edit-through-three-levels 35.2 / 34.6 / 0.98 edit-through-a-chain-of-dependents 68.9 / 63.5 / 0.92 library-update-into-copies 83.1 / 76.4 / 0.92 main-edit-into-10-copies 1.8 / 1.6 / 0.87 main-edit-into-100-copies 15.4 / 15.1 / 0.98 main-edit-into-1000-copies 153.1 / 148.8 / 0.97 variant-switch-into-copies 32.1 / 26.4 / 0.82 AI-assisted-by: claude-opus-5-5