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/Sessions/Participants/NoOpBotParticipantTests.cs

@@ -22,7 +22,7 @@ public class NoOpBotParticipantTests
             Cat: EmitCategory.Battle, PubSeq: null, PlaySeq: null,
             Body: new ResultCodeOnlyBody());
 
-        Assert.DoesNotThrowAsync(() => p.PushAsync(env, noStock: false, CancellationToken.None));
+        Assert.DoesNotThrowAsync(() => p.PushAsync(env, Stock.Normal, CancellationToken.None));
         Assert.That(fired, Is.EqualTo(0));
     }