Remove obsolete project files for MrGameEng.AI, MrGameEng.Assets, MrGameEng.Atlases, and MrGameEng.Collisions modules. Introduce new AssetManager and related classes for asset loading and management, including support for texture atlases and mod definitions. Enhance mod loading capabilities with DefDatabase and LanguageManager for JSON-based definitions and localization. Implement a shelf packing algorithm for efficient texture atlas creation.

src/MrGameEng.Simulation/AI/Blackboard.cs

@@ -0,0 +1,50 @@
+namespace MrGameEng.AI;
+
+/// <summary>
+/// A small typed key/value store for an agent's working memory: perceived facts, a current target, a
+/// cached path goal — whatever the considerations and actions need to share without being threaded
+/// through method signatures. Keys are case-sensitive strings; values are stored boxed, so the
+/// blackboard is a convenience for cold paths (perception, planning), not the per-frame hot loop.
+/// </summary>
+public sealed class Blackboard
+{
+    private readonly Dictionary<string, object?> _values = new(StringComparer.Ordinal);
+
+    /// <summary>The number of keys currently stored.</summary>
+    public int Count => _values.Count;
+
+    /// <summary>Stores <paramref name="value"/> under <paramref name="key"/>, replacing any existing entry.</summary>
+    public void Set<T>(string key, T value) => _values[key] = value;
+
+    /// <summary>
+    /// Reads the value under <paramref name="key"/> as <typeparamref name="T"/>. Returns <c>false</c> when
+    /// the key is missing or holds a value of a different type.
+    /// </summary>
+    public bool TryGet<T>(string key, out T value)
+    {
+        if (_values.TryGetValue(key, out var stored) && stored is T typed)
+        {
+            value = typed;
+            return true;
+        }
+
+        value = default!;
+        return false;
+    }
+
+    /// <summary>
+    /// Reads the value under <paramref name="key"/>, or returns <paramref name="fallback"/> when the key is
+    /// missing or holds a different type.
+    /// </summary>
+    public T GetOrDefault<T>(string key, T fallback = default!) =>
+        TryGet<T>(key, out var value) ? value : fallback;
+
+    /// <summary>True when <paramref name="key"/> has a value (of any type).</summary>
+    public bool Has(string key) => _values.ContainsKey(key);
+
+    /// <summary>Removes <paramref name="key"/>. Returns true when it was present.</summary>
+    public bool Remove(string key) => _values.Remove(key);
+
+    /// <summary>Drops every stored value.</summary>
+    public void Clear() => _values.Clear();
+}