refactor(battle-node): extract TurnEndHandler

SVSim.BattleNode/Sessions/Dispatch/Handlers/TurnEndHandler.cs

@@ -0,0 +1,41 @@
+using SVSim.BattleNode.Protocol;
+
+namespace SVSim.BattleNode.Sessions.Dispatch.Handlers;
+
+internal sealed class TurnEndHandler : IFrameHandler
+{
+    public IReadOnlyList<DispatchRoute> Handle(FrameDispatchContext ctx)
+    {
+        // case 4: Bot — Judge to sender only (no real opponent; client flips back to its local AI).
+        if (ctx.Type == BattleType.Bot && ctx.SenderPhase == BattleSessionPhase.AfterReady)
+            return new[] { new DispatchRoute(ctx.From, BattleFrames.BuildJudgeBroadcast(), false) };
+
+        // case 8: general AfterReady arm — matches (and consumes) for any non-Bot type once the
+        // sender is AfterReady, even if it yields no routes (legacy `break;`).
+        if (ctx.SenderPhase == BattleSessionPhase.AfterReady)
+        {
+            if (ctx.Type == BattleType.Pvp && ctx.BothAfterReady())
+            {
+                var te = BattleFrames.BuildTurnEndBroadcast();
+                var jg = BattleFrames.BuildJudgeBroadcast();
+                return new[]
+                {
+                    new DispatchRoute(ctx.From, te, false),
+                    new DispatchRoute(ctx.Other, te, false),
+                    new DispatchRoute(ctx.From, jg, false),
+                    new DispatchRoute(ctx.Other, jg, false),
+                };
+            }
+            if (ctx.Type == BattleType.Scripted)
+                return new[] { new DispatchRoute(ctx.Other, ctx.Env, false) };
+
+            return Array.Empty<DispatchRoute>(); // Pvp-not-both-ready → drop (Bot already returned above)
+        }
+
+        // case 11: scripted-bot TurnEnd whose sender has no handshake phase (test stub) → forward.
+        if (ctx.IsScriptedBot(ctx.From))
+            return new[] { new DispatchRoute(ctx.Other, ctx.Env, false) };
+
+        return Array.Empty<DispatchRoute>();
+    }
+}