Add core gameplay systems and data assets for player mechanics

- Implemented DA_EquipmentConfig for managing equipment resistances, durability, and weight.
- Created DA_ItemData to serve as a base item data asset with various item types and properties.
- Introduced BPC_HealthSystem for managing player health and death events.
- Added BPC_MovementStateSystem to handle player movement modes with event delegation.
- Developed BPC_StaminaSystem to track player stamina and exhaustion states.
- Established BPC_StateManager as a central authority for managing player action states and gating.
- Created BPC_StressSystem to monitor and respond to player stress levels.
- Implemented PC_CoreController and PS_CorePlayerState for player controller and state management.
- Developed SS_SaveManager for save/load functionality with slot management and serialization.
- Introduced DA_StateGatingTable for defining action gating rules based on gameplay tags.
- Added BPC_DamageReceptionSystem to process incoming damage and apply resistance calculations.
- Implemented BPC_HitReactionSystem for managing hit reactions based on damage received.
- Created BPC_ShieldDefenseSystem to manage shield health and blocking mechanics.
- Added PG_FrameworkEditor.Target.cs for editor build configuration.

Source/PG_Framework/Public/Save/SS_SaveManager.h

@@ -0,0 +1,193 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+// UE5 Modular Game Framework — SS_SaveManager (35)
+// Save/Load subsystem. Slot management, serialization, manifest tracking.
+// In C++, uses FArchive for direct binary serialization — far more powerful
+// than Blueprint "Save Game" / "Load Game" nodes.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Subsystems/GameInstanceSubsystem.h"
+#include "GameplayTagContainer.h"
+#include "SS_SaveManager.generated.h"
+
+/**
+ * Save slot metadata returned by GetSlotManifest().
+ */
+USTRUCT(BlueprintType)
+struct FRAMEWORK_API FSaveSlotInfo
+{
+	GENERATED_BODY()
+
+	UPROPERTY(BlueprintReadOnly)
+	int32 SlotIndex = -1;
+
+	UPROPERTY(BlueprintReadOnly)
+	FString SlotName;
+
+	UPROPERTY(BlueprintReadOnly)
+	FString ChapterName;
+
+	UPROPERTY(BlueprintReadOnly)
+	float PlayTimeHours = 0.0f;
+
+	UPROPERTY(BlueprintReadOnly)
+	FDateTime Timestamp;
+
+	UPROPERTY(BlueprintReadOnly)
+	FGameplayTag LastCheckpoint;
+
+	UPROPERTY(BlueprintReadOnly)
+	bool bIsEmpty = true;
+};
+
+// Delegates
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnSaveComplete, int32, SlotIndex, bool, bSuccess);
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnLoadComplete, int32, SlotIndex, bool, bSuccess);
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnSaveManifestUpdated, const TArray<FSaveSlotInfo>&, Slots);
+
+/**
+ * SS_SaveManager — Save/Load Subsystem.
+ *
+ * Manages all save slots, serialization, and manifest tracking.
+ * C++ gives us direct FArchive-based serialization, proper error handling,
+ * and async save operations — impossible to match in Blueprint.
+ */
+UCLASS()
+class FRAMEWORK_API USS_SaveManager : public UGameInstanceSubsystem
+{
+	GENERATED_BODY()
+
+public:
+	USS_SaveManager();
+
+	// ========================================================================
+	// Lifecycle
+	// ========================================================================
+
+	virtual void Initialize(FSubsystemCollectionBase& Collection) override;
+	virtual void Deinitialize() override;
+
+	// ========================================================================
+	// Configuration
+	// ========================================================================
+
+	/** Maximum number of save slots. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Framework|Save")
+	int32 MaxSlots = 10;
+
+	/** Save game file prefix for slot naming. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Framework|Save")
+	FString SavePrefix = TEXT("FrameworkSave_");
+
+	// ========================================================================
+	// Slot Manifest
+	// ========================================================================
+
+	/**
+	 * Returns metadata for all save slots.
+	 * Fast — reads header only, not full save data.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	TArray<FSaveSlotInfo> GetSlotManifest() const;
+
+	/**
+	 * Checks if a slot has save data.
+	 */
+	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Framework|Save")
+	bool DoesSlotExist(int32 SlotIndex) const;
+
+	// ========================================================================
+	// Save / Load Operations
+	// ========================================================================
+
+	/**
+	 * Save game to a slot. Returns true if successful.
+	 * Server-authoritative in multiplayer.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool SaveGame(int32 SlotIndex, const FString& Description);
+
+	/**
+	 * Load game from a slot. Returns true if successful.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool LoadGame(int32 SlotIndex);
+
+	/**
+	 * Delete a save slot. Irreversible!
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool DeleteSlot(int32 SlotIndex);
+
+	/**
+	 * Quick-save to the current active slot.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool QuickSave();
+
+	/**
+	 * Quick-load from the current active slot.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool QuickLoad();
+
+	// ========================================================================
+	// Checkpoint Management
+	// ========================================================================
+
+	/** Loads the most recent checkpoint from a slot. */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool LoadCheckpoint(int32 SlotIndex);
+
+	/**
+	 * Creates a checkpoint within the current slot.
+	 * Checkpoints are incremental saves within a single slot.
+	 */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool CreateCheckpoint(FGameplayTag CheckpointTag);
+
+	// ========================================================================
+	// Event Dispatchers
+	// ========================================================================
+
+	UPROPERTY(BlueprintAssignable, Category = "Framework|Events")
+	FOnSaveComplete OnSaveComplete;
+
+	UPROPERTY(BlueprintAssignable, Category = "Framework|Events")
+	FOnLoadComplete OnLoadComplete;
+
+	UPROPERTY(BlueprintAssignable, Category = "Framework|Events")
+	FOnSaveManifestUpdated OnSaveManifestUpdated;
+
+	// ========================================================================
+	// Utilities
+	// ========================================================================
+
+	/** Returns the total disk space used by all saves (in bytes). */
+	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Framework|Save")
+	int64 GetTotalSaveSize() const;
+
+	/** Backs up all save slots to a Backup/ subdirectory. */
+	UFUNCTION(BlueprintCallable, Category = "Framework|Save")
+	bool BackupAllSaves(const FString& BackupLabel);
+
+protected:
+	/** Builds the save slot name from prefix + index. */
+	FString GetSlotName(int32 SlotIndex) const;
+
+	/** Reads only the header/metadata from a save file. */
+	FSaveSlotInfo ReadSlotHeader(int32 SlotIndex) const;
+
+	/** Internal save implementation using FArchive serialization. */
+	bool SaveToFile(int32 SlotIndex, const TArray<uint8>& Data, const FSaveSlotInfo& Meta);
+
+	/** Internal load implementation. */
+	bool LoadFromFile(int32 SlotIndex, TArray<uint8>& OutData, FSaveSlotInfo& OutMeta);
+
+	/** Path to the save directory. */
+	FString GetSaveDirectory() const;
+
+	/** Currently active save slot (from GI_GameFramework). */
+	int32 GetActiveSlot() const;
+};