Embedded sections no longer show comment controls

Pages composed of @@ embeds used to repeat the commenting surface for every embedded section: each one showed its own "Add Comment" footer, offered a Comment button on any text selection, and displayed comment highlights from the embedded node. On a proposal or course page built from several sections, that read as comments everywhere.

Embeds now render the content only. Commenting still works exactly as before on each node's own page — open the embedded section directly to read or add comments. Authors who want an embed to keep its full page chrome, including comments, can opt back in with @@node?showHeader=true.