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- The sync walk took its direction as a map of seven closures (direct-sync, inverse-sync). The two directions are fixed, so each is now a plain recursive function: sync-copy-recursive (main to copy, a sync or a reset) and update-main-recursive (copy to main), with sync-copy-shape and update-main-shape for the pair itself. Both share compare-children, which takes the children, a pair? predicate and four callbacks instead of 13 arguments; the inverse branch's call of the swapped callback, which could never run, goes. - The container of the main shapes is found once, at the start of the walk. The walk holds the :remote-synced a reset or an update main gives the copy shapes, instead of initial-root? and two branches. add-shape-to-instance and add-shape-to-main take the parent from the pair being walked instead of searching the whole subtree for it. - pcb/add-changes takes a container and the redo and undo changes, and applies them locally. Eight sync functions and the library typography sync each wrote that block; make-change goes from both namespaces. One list holds the attributes that link a copy shape with its main, and one shape-label prints shapes in the log lines. - change-touched chose what to write from three flags. It is now set-touched, which takes the value each caller computes. The swap's restore of the kept properties passes ignore-touched instead of calling it afterwards to put the groups back. - generate-sync-shape was a multimethod over the three asset types; it is a case in generate-sync-container. generate-sync-file loses its unused arity. The 100-line comment that opened the sync helpers described an older model; a short note points at the component sync contract. text-content-with-overrides only called txt/merge-overrides, which sync and switch now call. - update-flex-child-copy-attrs and update-flex-child-main-attrs are one function, update-flex-children, and the omit-touched? argument that was always false goes. - In the variant switch, sized-geometry-value builds the resized :selrect and :points that two geometry policies each built, and a binding of skip? shadowed by a second one is skip-attr?. add-shape-to-main keeps two changes that look wrong, now marked F102: its :reg-objects names the component, so it only reaches a deleted component's objects, and the undo of its new shapes deletes them from the copy's page. No behavior change: the golden masters and the suites are unchanged. libraries.cljc: 1816 -> 1284 lines. Benchmark (lower quantile, ms; baseline / now / ratio): deepest-edit-through-three-levels 35.2 / 15.2 / 0.43 edit-through-a-chain-of-dependents 68.9 / 35.7 / 0.52 library-update-into-copies 83.1 / 40.5 / 0.49 main-edit-among-many-shapes 4.8 / 2.4 / 0.51 main-edit-into-10-copies 1.8 / 0.8 / 0.46 main-edit-into-100-copies 15.4 / 7.8 / 0.51 main-edit-into-1000-copies 153.1 / 97.4 / 0.64 variant-switch-into-copies 32.1 / 17.6 / 0.55 (The machine was busy for the 1000-copies world: its mean was 119 ms, against about 83 in the runs of the earlier steps, at 0.49-0.52.) AI-assisted-by: claude-opus-5-5 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>