new battle gui

src/BattleLogHub.cs

@@ -0,0 +1,24 @@
+using System;
+using Cthangover.CardBattle.UI;
+
+namespace Cthangover.CardBattle
+{
+    /// <summary>
+    /// Static sink for battle journal entries. Player action strategies and
+    /// the battle core run without a reference to the UI screen, so they
+    /// publish here instead of reaching into the scene tree; the
+    /// <see cref="BattleLogPanel"/> subscribes while it exists and unsubscribes
+    /// on tree exit, which keeps the hub empty outside of a battle. This is the
+    /// same service-locator pattern the battle code already uses for
+    /// <c>ActionExecutorHub</c> and <c>ShowDamageBehaviour</c>.
+    /// </summary>
+    public static class BattleLogHub
+    {
+        /// <summary>Fired for every entry; handlers receive the text and its kind.</summary>
+        public static event Action<string, BattleLogKind> Entry;
+
+        /// <summary>Publishes one journal row. No-op when no battle UI is listening.</summary>
+        public static void Log(string text, BattleLogKind kind = BattleLogKind.Info)
+            => Entry?.Invoke(text, kind);
+    }
+}