feat: add experimental game engine & demo game, fix ACPI events

kernel/src/ACPI/AcpiEvents.cpp

@@ -79,8 +79,7 @@ namespace Hal {
                 KernelLogStream(INFO, "ACPI") << "Sleep button pressed";
             }
 
-            // Send EOI
-            LocalApic::SendEOI();
+            // Note: EOI is sent by HalIrqDispatch after this handler returns.
         }
 
         // ============================================================================
@@ -88,7 +87,13 @@ namespace Hal {
         // Initialize
 
         // ============================================================================
-        void Initialize(const FADT::ParsedFADT& fadt) {
+        void Initialize(ACPI::CommonSDTHeader* xsdt) {
+            FADT::ParsedFADT fadt{};
+            if (!FADT::Parse(xsdt, fadt) || !fadt.Valid) {
+                KernelLogStream(ERROR, "ACPI") << "Failed to parse FADT - ACPI events unavailable";
+                return;
+            }
+
             g_pm1aEventBlock = fadt.PM1aEventBlock;
             g_pm1bEventBlock = fadt.PM1bEventBlock;
             g_pm1EventLength = fadt.PM1EventLength;

kernel/src/ACPI/AcpiEvents.hpp

@@ -13,8 +13,8 @@ namespace Hal {
 
         // Initialize ACPI event handling: route the SCI interrupt,
         // register the handler, and enable fixed events (power button).
-        // Must be called after APIC and FADT initialization.
-        void Initialize(const FADT::ParsedFADT& fadt);
+        // Must be called after APIC initialization.
+        void Initialize(ACPI::CommonSDTHeader* xsdt);
 
         // Re-enable ACPI events after S3 resume.
         void Reinitialize();

kernel/src/ACPI/AcpiShutdown.cpp

@@ -69,8 +69,8 @@ namespace Hal {
             // Initialize S3 suspend support (reads FACS and \_S3_ from namespace)
             AcpiSleep::Initialize(xsdt);
 
-            // Initialize ACPI event handling (SCI interrupt, power button)
-            AcpiEvents::Initialize(fadt);
+            // Note: ACPI event handling (SCI, power button) is initialized
+            // from Main.cpp after the APIC subsystem is ready.
         }
 
         bool IsAvailable() {