Merge branch 'origin/master' - combine double-execution fixes

Both branches fixed the --exec double-execution bug with complementary approaches:
- origin/master: Added executeStartupScripts() method for cleaner separation
- HEAD: Avoided engine recreation to preserve state

This merge keeps the best of both: executeStartupScripts() called on the
existing engine without recreation.

Also accepts deletion of flaky test_viewport_visual.py from origin/master.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/GameEngine.cpp

@@ -63,23 +63,31 @@ GameEngine::GameEngine(const McRogueFaceConfig& cfg)
         McRFPy_API::executePyString("import mcrfpy");
         McRFPy_API::executeScript("scripts/game.py");
     }
-    
+
+    // Note: --exec scripts are NOT executed here.
+    // They are executed via executeStartupScripts() after the final engine is set up.
+    // This prevents double-execution when main.cpp creates multiple GameEngine instances.
+
+    clock.restart();
+    runtime.restart();
+}
+
+void GameEngine::executeStartupScripts()
+{
     // Execute any --exec scripts in order
+    // This is called ONCE from main.cpp after the final engine is set up
     if (!config.exec_scripts.empty()) {
         if (!Py_IsInitialized()) {
             McRFPy_API::api_init();
         }
         McRFPy_API::executePyString("import mcrfpy");
-        
+
         for (const auto& exec_script : config.exec_scripts) {
             std::cout << "Executing script: " << exec_script << std::endl;
             McRFPy_API::executeScript(exec_script.string());
         }
         std::cout << "All --exec scripts completed" << std::endl;
     }
-
-    clock.restart();
-    runtime.restart();
 }
 
 GameEngine::~GameEngine()

src/GameEngine.h

@@ -146,6 +146,7 @@ public:
     void run();
     void sUserInput();
     void cleanup(); // Clean up Python references before destruction
+    void executeStartupScripts(); // Execute --exec scripts (called once after final engine setup)
     int getFrame() { return currentFrame; }
     float getFrameTime() { return frameTime; }
     sf::View getView() { return visible; }

src/main.cpp

@@ -183,8 +183,8 @@ int run_python_interpreter(const McRogueFaceConfig& config)
         return 0;
     }
     else if (!config.exec_scripts.empty()) {
-        // With --exec, scripts were already executed by the first GameEngine constructor.
-        // Just configure auto-exit and run the existing engine to preserve timers/state.
+        // Execute startup scripts on the existing engine (not in constructor to prevent double-execution)
+        engine->executeStartupScripts();
         if (config.headless) {
             engine->setAutoExitAfterExec(true);
         }