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/TurnEndHandler.cs

@@ -9,7 +9,7 @@ internal sealed class TurnEndHandler : IFrameHandler
     {
         // case 4: Bot — Judge to sender only (no real opponent; client flips back to its local AI).
         if (ctx.Type == BattleType.Bot && ctx.SenderPhase == BattleSessionPhase.AfterReady)
-            return new[] { new DispatchRoute(ctx.From, BattleFrames.BuildJudgeBroadcast(), false) };
+            return new[] { new DispatchRoute(ctx.From, BattleFrames.BuildJudgeBroadcast(), Stock.Normal) };
 
         // case 8: general AfterReady arm — PvP forwards a {turnState} TurnEnd to the opponent
         // (handover gate). Any non-Pvp non-Bot type that reaches AfterReady consumes the frame.
@@ -21,7 +21,7 @@ internal sealed class TurnEndHandler : IFrameHandler
                 // the opponent (the turn taker-over) then sends a Judge, which JudgeHandler reflects
                 // back to it to start its turn. battleCode/actionSeq/cemetery are dropped.
                 var te = ctx.Env with { Body = new TurnEndBody(TurnState: TurnState.First) };
-                return new[] { new DispatchRoute(ctx.Other, te, false) };
+                return new[] { new DispatchRoute(ctx.Other, te, Stock.Normal) };
             }
             return Array.Empty<DispatchRoute>(); // Pvp-not-both-ready → drop (Bot already returned above)
         }