Restore aura visuals after loading a save

Saving marks effect objects dead, so after a load the Heldenmut /
Klingenblick buff was active but its aura effect (cObjectFX 842) was
gone. A few ticks after a save game has loaded, the effect is created
again for each such buff of a player hero (CreateAt + cEventFX 0x42,
as the art's cast effect does), with the buff's remaining time.

Shared game events (game/engine/events): engine tick and "save game
loaded" callbacks; the WASD mod uses the tick through it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/mods/wasd.cpp

@@ -20,6 +20,7 @@
 
 #include <windows.h>
 
+#include "game/engine/events.h"
 #include "game/engine/objects.h"
 #include "mods/input.h"
 #include "re/hook.h"
@@ -126,19 +127,11 @@ void Update(uint8_t* engine) {
     g_move.moving = true;
 }
 
+namespace {
+struct Registration {
+    Registration() { game::OnEngineTick(&Update); }
+} g_registration;
+} // namespace
+
 } // namespace mods::wasd
 
-namespace game {
-
-// cEngine::Tick (0x60f1d0, 10 Hz): processes queued events, then the mouse's
-// hold-to-move re-aim orders.
-void __fastcall Engine_Tick(void* self, void* edx, void* event);
-RE_HOOK(0x0060f1d0, Engine_Tick);
-void __fastcall Engine_Tick(void* self, void* edx, void* event) {
-    Engine_Tick_original(self, edx, event);
-    if (self) {
-        mods::wasd::Update(static_cast<uint8_t*>(self));
-    }
-}
-
-} // namespace game