Complete AdventureBot navigation, instance travel and shutdown fixes

Finish capital waiting travel and adaptive flight entry up to 10,000 yards.
Preserve checked vertical climbs, recover blocked ground departures and find
validated dry landings. Retain group routes and Undercity arrival constraints.

Restore defense from native combat references, coordinate instance rendezvous
and browser reentry, finalize clientless sessions before map destruction and
transfer Halaa capture-point ownership safely.

Include the associated regression tests, investigation reports and reusable
diagnostic scripts. Keep generated runtime evidence and server binaries local
through scoped ignore rules. Validation/build/live evidence is recorded in the
session checkpoint and individual reports.

src/server/game/World/ClientlessLuaEngine.cpp

@@ -261,6 +261,7 @@ public:
         // Browser responses remain independent of combat and supply animations.
         sAdventureGroupMgr->UpdateBrowser(player);
         sAdventureGroupTravelMgr->Observe(player,diff);
+        if(sAdventureGroupTravelMgr->HoldForInstanceLeader(player))return;
         sAdventurePopulationMgr->Maintain(player,diff);
         // Restart restores native ship attachment, but CPC ride execution is
         // transient. Own its safe recorded exit before starting another action.