Clarify World stub methods: terrain/entity state lives in subsystems

Remove TODO comments from World::update() and World::loadMap() and
replace with explanatory comments. World is an intentional thin token;
the actual work happens in Application (TerrainManager, camera) and
GameHandler (packet processing). This reflects the current architecture
rather than implying missing work.

src/game/world.cpp

@@ -4,11 +4,14 @@ namespace wowee {
 namespace game {
 
 void World::update([[maybe_unused]] float deltaTime) {
-    // TODO: Update world state
+    // World state updates are handled by Application (terrain streaming, entity sync,
+    // camera, etc.) and GameHandler (server packet processing). World is a thin
+    // ownership token; per-frame logic lives in those subsystems.
 }
 
 void World::loadMap([[maybe_unused]] uint32_t mapId) {
-    // TODO: Load map data
+    // Terrain loading is driven by Application::loadOnlineWorld() via TerrainManager.
+    // This method exists as an extension point; no action needed here.
 }
 
 } // namespace game