Duplicate's own posture — a faithful copy, `.git` the sole exclusion, attachments/comments/trash
carried verbatim — staged to a temp directory (BoardShareStager, ditto-zipped via
DittoZipArchiver) and presented through NSSharingServicePicker (BoardSharePresentation), anchored
to the board window's toolbar or its center. Follows Duplicate/Save as Template's flush-then-
cancellable-copy sequence under the banner's in-progress row (ShareBoardCommand, AppCommands.swift),
menu-validated on focus alone rather than the read-only lock (a share is a read, Print's own
posture) with the one carve-out an open inline title editor still needs. WriteOperation gains
.shareBoard for the banner vocabulary; 11-command-nexus.md's File menu table gains the row.
Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
