docs(rust): the NPC picker's comment says what stage 9 kept (D310)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/model/npcs/npcs.model.js

@@ -454,7 +454,9 @@ const PROFILE_PREFIX = 'profile:'
 
 /**
  * The site's profiles, first, grouped, for any server that has RunicNPC. A site
- * with no such server offers none (D243: Rust's own only until stage 9).
+ * with no such server offers none, and the picker lists Rust's own as before: since
+ * stage 9 those are refused on save there too, with the reason (D310; the org lead
+ * kept the list rather than change core's option sources, 2026-10-06).
  */
 async function optionRows() {
   const [profiles, list] = await Promise.all([db.listProfiles(), db.listNpcServers()])