Document teams, gold sending, spectators and editor co-op runs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/CAMPAIGN_EDITOR.md

@@ -117,8 +117,12 @@ Ctrl+Z/Y undo/redo, Ctrl+C/V copy/paste the selected block, Delete removes it, C
   save; *Published* adds the campaign to the list every logged-in player sees and can open (as a
   copy) and play. Server API: `/api/campaigns`, `/api/public/campaigns` (see `server/src/main.rs`).
 - **Co-op**: the campaign last opened in the editor can be played in a co-op match (Multiplayer,
-  *Editor campaign*), one mission per match; missions need a map of at least 72x72 and a goal besides
-  rival masters. See `docs/MULTIPLAYER.md`.
+  *Editor campaign*); missions need a map of at least 72x72 and a goal besides rival masters. The run
+  goes on over several missions: after a win the host starts the next mission (the branch of the reached
+  goal, or *next mission*) for everybody, after a defeat the same one again. Every player takes his five
+  strongest creatures and a fifth of his gold along; the host keeps the progress (missions done, chosen
+  branches, run seed). The room list shows the campaign's name and the current mission. See
+  `docs/MULTIPLAYER.md`.
 
 ## File format (`src/campaign_doc.rs`)