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/Bridge/BattleNodeOptions.cs

@@ -20,7 +20,7 @@ public sealed class BattleNodeOptions
     /// When true, <see cref="Sessions.Participants.RealParticipant"/> emits per-frame
     /// diagnostic logs at Information level: <c>[sio-in]</c> on every inbound msg/alive/hand
     /// envelope (URI, pubSeq, ackId, dispatch decision, ack-sent flag, ack arg, inbound
-    /// watermark); <c>[sio-out]</c> on every outbound push (URI, pubSeq, playSeq, noStock);
+    /// watermark); <c>[sio-out]</c> on every outbound push (URI, pubSeq, playSeq, stock);
     /// <c>[ws-rx-text]</c> / <c>[ws-rx-bin]</c> on every WS frame received at the transport
     /// layer; <c>[ws-recv-exit]</c> / <c>[ws-loop-exit]</c> on read-loop termination
     /// (with WebSocket state + exception type when applicable). Default false — keeps