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* 🐛 Add regression test: main-side component edits break copy swap slots Reproduces the :missing-slot referential-integrity failure ("Shape has been swapped, should have swap slot") that crashes files with component copies. Root cause: reordering or deleting a nested sub-head IN THE MAIN of a component, while copies exist, does not propagate swap slots to the copies. find-near-match matches a copy's sub-heads to the main's children by POSITION, so once the main's order changes the copies' shape-refs no longer match their position and, lacking a swap slot, fail referential-integrity validation. - Copy-side edits are handled correctly (characterization tests, pass today). - The two main-side tests fail today with :missing-slot and go green once the sync assigns swap slots to copies on a main reorder/delete. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * 🐛 Fix integrity crashes from copy/main child-order divergence Copy sub-heads were matched to their main's children purely by position (find-near-match), while several code paths reorder or mutilate one side only. Any of them made file validation fail with :missing-slot ("Shape has been swapped, should have swap slot"), crashing the workspace on the next validated commit, or persisting a corrupt file whose later edits crash. Reproduced live: deleting a sub-head inside a copy (which only hides it) and then reflowing the copy's grid moved the hidden (cell-less) child to the front of :shapes, knocking every sibling out of its positional slot. Four fixes, one per divergence path: - validate/check-required-swap-slot: a sub-head whose shape-ref is still a child of the near main parent is a REORDER (the component sync realigns it), not a swap; a swap slot is required only when the ref points outside the near main parent (a real swap). This matches how the sync engine itself pairs children (by shape-ref, not by position). comp-processors/fix-missing-swap-slots (migration 0019) is aligned: adding slots to merely-reordered sub-heads would freeze them out of normal synchronization. - changes/:reorder-children now refuses to alter the child structure of component copies unless allow-altering-copies is set, mirroring the is-valid-move? rule of :mov-objects; that structure is owned by the component sync engine. Grid reflows emitted this change type with no guard. pcb/reorder-grid-children also skips copy grids producer-side. - layout/reorder-grid-children keeps children that participate in no cell (hidden or absolute positioned) at their original index instead of lumping them at the front: moving them gratuitously changed their z-order and, in copies, broke the positional matching. Note :shapes stays reversed relative to the sorted cell order for in-cell children. - logic/generate-delete-shapes: deleting shapes from inside a main (without deleting the main root, whose copies keep working against the deleted component) now also deletes the copy shapes that reference them, transitively (copies of copies) and across all pages of the file, so no dangling shape-refs remain. Skipped for allow-altering-copies flows (component swap replaces the shape and the sync reconciles copies via swap slots). Cross-page removals build redo/undo changes against that page's objects directly, since the changes-builder mounts only the current page; their undo mov-objects carry allow-altering-copies so restoring inside a copy is not rejected by the new guard. The regression tests assert the fixed semantics: main-side reorders and deletes keep copies valid, the previously crashing full chain (unvalidated main reorder + later copy edit) stays healthy, :reorder-children cannot scramble copies, and reorder-grid-children keeps cell-less children in place. The namespace is now also registered in the JS test runner. AI-assisted-by: Claude Opus 4.8 (1M context) * ✨ Extend composable slot cases to the grid-reflow crash sweep Case D (CopySubheadDeletePreservesSlots) now sweeps which copy sub-head is deleted (first or last) and whether the copy root is resized afterwards, forcing a grid reflow: the reflow used to move the hidden (cell-less) child to the front of the copy's children, shifting every sibling out of its positional slot. Deleting the FIRST sub-head masked the bug (moving it to the front is a no-op), which is why the case passed before this sweep. The foundation layout is grid accordingly. Case E (MainReorderKeepsCopySlots) no longer hangs the app now that a main-side reorder leaves a valid file, so its warning docstring is replaced: it runs as a routine test (verified headless, passing) and is safe in a "run all". SlotIntegrity's doc is updated to the new validator semantics (a slot is required only for real swaps, not reorders); the positional alignment it asserts remains the correct, stronger steady-state invariant for these cases. The lockfile change materializes the playwright devDependency already declared in package.json. AI-assisted-by: Claude Opus 4.8 (1M context) * 📚 Record copy/main order-divergence invariants in memories Swap-slot semantics (membership, not positional; slots only for real swaps), the copy-structure guards on :mov-objects/:reorder-children, the grid reorder stability for cell-less children, and the main-side delete propagation in generate-delete-shapes. AI-assisted-by: Claude Opus 4.8 (1M context) * 🐛 Add adjustements to the code --------- Co-authored-by: Michael Panchenko <michael.panchenko@oraios-ai.de> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>