The prior 'nest shopfloor menu as a tab' commit only captured the shopfloor_menu.html deletion - the git add also named the just-removed file, which errored the add and staged nothing else. This commits the actual integration that was already deployed to preview and prod: startnet_editor GET passes shopfloor_items/shopfloor_available, the Shopfloor Sub-Menu tab pane + sf-prefixed JS in startnet_editor.html, /shopfloor-menu redirects into the tab, and the sidebar 'startnet.cmd' -> 'Boot Menu' rename.
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