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.UnitTests/BattleNode/Integration/CaptureConformanceTests.cs

@@ -414,7 +414,7 @@ public class CaptureConformanceTests
             .MineCopyTokens(orderList, new Dictionary<int, long>(), otherMap)
             .ToList();
 
-        Assert.That(mined, Is.EquivalentTo(new[] { (49, 123_456_789L, CardOwner.Opponent) }));
+        Assert.That(mined, Is.EquivalentTo(new[] { new SVSim.BattleNode.Sessions.Dispatch.MinedToken(49, 123_456_789L, CardOwner.Opponent) }));
     }
 
     [Test]