added items

src/Automata.Memory/TerrainOffsets.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Serilog;
+
+namespace Automata.Memory;
+
+public sealed class TerrainOffsets
+{
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        WriteIndented = true,
+        DefaultIgnoreCondition = JsonIgnoreCondition.Never
+    };
+
+    public string ProcessName { get; set; } = "PathOfExileSteam";
+
+    /// <summary>Pattern to find GameState base pointer. Empty = unknown for POE2.</summary>
+    public string GameStatePattern { get; set; } = "";
+
+    // Pointer chain: GameState → InGameState → IngameData → TerrainData
+    public int InGameStateOffset { get; set; }
+    public int IngameDataOffset { get; set; }
+    public int TerrainDataOffset { get; set; }
+
+    // Within TerrainData struct
+    public int NumColsOffset { get; set; }
+    public int NumRowsOffset { get; set; }
+    public int LayerMeleeOffset { get; set; }
+    public int BytesPerRowOffset { get; set; }
+
+    /// <summary>Number of sub-tiles per terrain cell (typically 23 for POE).</summary>
+    public int SubTilesPerCell { get; set; } = 23;
+
+    public static TerrainOffsets Load(string path)
+    {
+        if (!File.Exists(path))
+        {
+            Log.Information("Offsets file not found at '{Path}', using defaults", path);
+            var defaults = new TerrainOffsets();
+            defaults.Save(path);
+            return defaults;
+        }
+
+        try
+        {
+            var json = File.ReadAllText(path);
+            var offsets = JsonSerializer.Deserialize<TerrainOffsets>(json, JsonOptions);
+            if (offsets is null)
+            {
+                Log.Warning("Failed to deserialize '{Path}', using defaults", path);
+                return new TerrainOffsets();
+            }
+            Log.Information("Loaded offsets from '{Path}'", path);
+            return offsets;
+        }
+        catch (Exception ex)
+        {
+            Log.Error(ex, "Error loading offsets from '{Path}'", path);
+            return new TerrainOffsets();
+        }
+    }
+
+    public void Save(string path)
+    {
+        try
+        {
+            var json = JsonSerializer.Serialize(this, JsonOptions);
+            File.WriteAllText(path, json);
+            Log.Debug("Saved offsets to '{Path}'", path);
+        }
+        catch (Exception ex)
+        {
+            Log.Error(ex, "Error saving offsets to '{Path}'", path);
+        }
+    }
+}