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/DispatchRoute.cs

@@ -3,6 +3,7 @@ using SVSim.BattleNode.Protocol;
 namespace SVSim.BattleNode.Sessions.Dispatch;
 
 /// <summary>One routing decision: deliver <paramref name="Frame"/> to <paramref name="Target"/>.
-/// Named form of the tuple <c>ComputeFrames</c> historically returned. <paramref name="NoStock"/>
-/// true for control frames (BattleFinish, ack) — bypasses playSeq assignment + archive.</summary>
-internal readonly record struct DispatchRoute(IBattleParticipant Target, MsgEnvelope Frame, bool NoStock);
+/// Named form of the tuple <c>ComputeFrames</c> historically returned. <paramref name="Stock"/>
+/// is <see cref="Sessions.Stock.Bypass"/> for control frames (BattleFinish, ack) — bypasses
+/// playSeq assignment + archive — and <see cref="Sessions.Stock.Normal"/> for gameplay frames.</summary>
+internal readonly record struct DispatchRoute(IBattleParticipant Target, MsgEnvelope Frame, Stock Stock);