- notes.Create(): .md files stored in parent node's fs_path folder
- files.CopyIntoVault/CreateEmptyFile/Duplicate: use parent fs_path
- files.AddPathCopy/AddPathLink: use parent fs_path, set folder fs_path
- files.DeleteNodeAndChildren: move physical folder to .verstak/trash
- UpdateFsPathRecursive: use SafeDisplayNameToPathSegment(child.Title)
- sync_apply.go note ops: use fs_path instead of spaces/
- internal/gui/server.go file upload: use n.FsPath instead of nodeSlug
- VaultCheck diagnostic: walk nodes/files, verify paths on disk
- Tests: create/rename/move/delete/name-conflict/vault-check all pass
mirivlad