refactor(battlenode): close §A boolean-blindness items (MinedToken, Stock, KeyActionType)

Behavior-preserving; 231 BattleNode tests green.

- MinedToken record struct replaces the transpose-prone (int Idx, long CardId,
  CardOwner IsSelf) tuple returned by KnownListBuilder.Mine*. Positional deconstruct
  keeps the Record*From call sites unchanged.
- enum Stock { Normal, Bypass } replaces the negative `bool noStock` on
  IBattleParticipant.PushAsync and DispatchRoute, threaded through both participants,
  BattleSession, and all handler construction sites.
- enum KeyActionType mirrors the client's SendKeyActionDataManager.KeyActionType;
  the StripKeyActionForOpponent guard compares named values, KeyActionEntry.Type is
  the enum (wire-identical via JsonNumberEnumConverter).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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

@@ -15,7 +15,7 @@ internal sealed class SwapHandler : IFrameHandler
         var hand = ServerBattleFrames.ComputeHandAfterSwap(BattleFrames.ExtractIdxList(ctx.Env));
 
         // SwapResponse is always immediate — completes the sender's own mulligan UI.
-        routes.Add(new DispatchRoute(ctx.From, ServerBattleFrames.BuildSwapResponse(hand), false));
+        routes.Add(new DispatchRoute(ctx.From, ServerBattleFrames.BuildSwapResponse(hand), Stock.Normal));
         ctx.State.PostSwapHands[ctx.From] = hand;
         ctx.SenderPhase = BattleSessionPhase.AfterReady;
 
@@ -32,7 +32,7 @@ internal sealed class SwapHandler : IFrameHandler
                             && ctx.State.PostSwapHands.TryGetValue(opponent, out var oppoHand)
                     ? ServerBattleFrames.BuildReady(ctx.State.PostSwapHands[p], oppoHand, idxSeed)
                     : ServerBattleFrames.BuildReady(ctx.State.PostSwapHands[p], idxSeed);
-                routes.Add(new DispatchRoute(p, ready, false));
+                routes.Add(new DispatchRoute(p, ready, Stock.Normal));
             }
         }
         return routes;