Add synthetic LAN event injection PoC + Soak Test disable fix

Hooks MapTrack::HandleEvent to fabricate a RaceEvent+CashReward+fake
Actor and insert it via the engine's own AddEvent, making a synthetic
"LAN: <lobby>" card appear on an already-loaded street entirely at
runtime (no game_cache/OBB/native_lib changes). Also hooks the
per-frame MapScreen tick to neutralize a QA-only "Soak Test" feature
whose index-based scan of a parallel, unsynced list was the root
cause of a delayed crash on injected entries.

Verified live on Galaxy A9 (2018): zero crashes across all reachable
pins, and a 10-minute soak test with zero crashes after the Soak Test
fix, confirmed against a genuinely responsive post-test map screen.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mpcore/src/main/cpp/main.cpp

@@ -16,6 +16,7 @@
 #include <iomanip>
 #include "util/armhook.h"
 #include "util/armhooks.h"
+#include "lan_event_injection.h"
 
 void* libapp_base = NULL;
 
@@ -176,6 +177,12 @@ static bool InstallBuildTrackScenePathHook() {
 // baseline/"before" comparison) - true installs the track-substitution hook.
 // Just edit this and rebuild, no need to touch anything else.
 static constexpr bool kEnableTrackSubstitutionHook = true;
+static constexpr bool kEnableLanEventInjectionHook = true;
+// See ANALYSIS.md §6ff/§6gg: prevents a QA-only "Soak Test" auto-race feature
+// from eventually crashing the process on entries our injection adds to the
+// prefab cache. Independent of kEnableLanEventInjectionHook so it can be kept
+// on even if injection itself is toggled off for testing.
+static constexpr bool kEnableSoakTestDisableHook = true;
 
 JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
 
@@ -183,6 +190,12 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
         if (kEnableTrackSubstitutionHook) {
             InstallBuildTrackScenePathHook();
         }
+        if (kEnableLanEventInjectionHook) {
+            InstallMapTrackHandleEventHook();
+        }
+        if (kEnableSoakTestDisableHook) {
+            InstallSoakTestDisableHook();
+        }
     }
 
     return JNI_VERSION_1_6;