test(webui): sp11 item 3, the w15 fixture answers the bus instances read the conversation page now makes, with no rows, so Resume shows as before and the read is not counted as unexpected (#1873, lane sp11-fixes)

packages/webui/tests/w15-fixture.mjs

@@ -45,7 +45,7 @@ export async function w15Fixture(t, { scenario = {}, slice = 'shell' } = {}) {
       if(/^\\/api\\/chat\\/threads\\/[^/]+\\/sessions$/.test(path)) return data({rows:[{id:ids.session,name:'Default',default:true}]});
       if(/^\\/api\\/chat\\/threads\\/[^/]+\\/messages(?:\\?.*)?$/.test(path)) return data({rows:[],after:null,hasMore:false});
       if(path==='/api/chat/threads' || /^\\/api\\/chat\\/threads\\?(shared=true|project=)/.test(path)) return data({rows:[{id:ids.thread,project:ids.project,name:'Project conversation',instance:'assistant'}]});
-      if(/^\\/api\\/bus\\/(inbox|messages|agents|tasks|queue|trail)(\\?|$)/.test(path)) return data({rows:[],unread:0});
+      if(/^\\/api\\/bus\\/(inbox|messages|agents|instances|tasks|queue|trail)(\\?|$)/.test(path)) return data({rows:[],unread:0});
       __unexpected.push(method+' '+path); return new Response(JSON.stringify({error:'fixture-unexpected-api'}),{status:403,headers:{'content-type':'application/json'}});
     };
   })();` });