Adding the bones of the drafting system by removing the wall and siege towers from the base set and adding them temporarily as choices for the draft. Also adding Project_Context and Project_Roadmap documents to use with Claude

Assets/_Project/Scripts/Gameplay/Draft/DraftPool.cs

@@ -0,0 +1,64 @@
+// Assets/_Project/Scripts/Gameplay/Draft/DraftPool.cs
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace TD.Gameplay.Draft
+{
+    /// <summary>
+    /// Scene singleton holding every <see cref="DraftOption"/> available this match. The
+    /// array index is the option's <c>DraftOptionId</c> — the stable identifier used to
+    /// replicate offers and picks over the network (mirrors the tower catalog pattern).
+    /// </summary>
+    /// <remarks>
+    /// Plain MonoBehaviour: identical on every peer (same assets), so there is nothing to
+    /// sync. The server reads it to generate offers and apply picks; clients read it to
+    /// render draft cards from the replicated option ids.
+    /// </remarks>
+    public class DraftPool : MonoBehaviour
+    {
+        public static DraftPool Instance { get; private set; }
+
+        [Tooltip("Every DraftOption asset that can be offered this match. Array index is " +
+                 "the DraftOptionId used over the network.")]
+        [SerializeField] private DraftOption[] options;
+
+        private void Awake()
+        {
+            if (Instance != null && Instance != this)
+            {
+                Debug.LogError("[DraftPool] Multiple instances detected. Only one per scene.");
+                return;
+            }
+            Instance = this;
+        }
+
+        private void OnDestroy()
+        {
+            if (Instance == this) Instance = null;
+        }
+
+        /// <summary>Number of options in the pool.</summary>
+        public int Count => options?.Length ?? 0;
+
+        /// <summary>Returns the option at <paramref name="id"/> (its DraftOptionId), or null.</summary>
+        public DraftOption Get(int id)
+            => (options != null && id >= 0 && id < options.Length) ? options[id] : null;
+
+        /// <summary>
+        /// Server-only helper: collects the ids of every option currently valid to offer
+        /// to <paramref name="clientId"/> (skips nulls and options whose
+        /// <see cref="DraftOption.IsValidFor"/> returns false). Used by
+        /// <see cref="DraftService"/> as the candidate set for the weighted draw.
+        /// </summary>
+        public void CollectValidIds(ulong clientId, List<int> into)
+        {
+            into.Clear();
+            if (options == null) return;
+            for (int i = 0; i < options.Length; i++)
+            {
+                if (options[i] == null) continue;
+                if (options[i].IsValidFor(clientId)) into.Add(i);
+            }
+        }
+    }
+}