Fix group preview bot admission and improve CI diagnostics

tests/richese-homeworld-marker-mixed-http.test.ts

@@ -61,6 +61,7 @@ void test('authenticated mixed transfer moves a concealed marker and physical vi
         const me = at.players.find(player => player.id === hostSeat.id)!;
         if (!me.shipped && me.reserves > 0) {
           let accepted = false;
+          const rejections: string[] = [];
           for (const territory of TERRITORIES.filter(item => item.type === 'stronghold')) {
             for (const sector of territory.sectors) {
               if (sector === at.storm) continue;
@@ -70,10 +71,13 @@ void test('authenticated mixed transfer moves a concealed marker and physical vi
               } });
               if (attempt.status === 200) { view = attempt.data; accepted = true; break; }
               assert.equal(attempt.status, 409, JSON.stringify(attempt.data));
+              rejections.push(`${territory.id}:${sector}: ${attempt.data.error ?? 'unknown rejection'}`);
             }
             if (accepted) break;
           }
-          assert.ok(accepted, 'Atreides can ship its physical reserves to an available stronghold.');
+          const source = at.homeworlds?.worlds?.find(world => world.id === 'homeworld:atreides')?.forces[hostSeat.id];
+          assert.ok(accepted, `Atreides cannot ship ${me.reserves} reserves with ${me.spice} spice ` +
+            `from Caladan ${JSON.stringify(source ?? null)}; storm ${at.storm}. Rejections: ${rejections.join('; ')}`);
           continue;
         }
       }