feat(battle-node): BuildBattleStart consumes MatchContext for player half

ClassId/CharaId/CardMasterName/BattleType flow from ctx. PlayerBattleStart
Profile removed; Rank/BattlePoint remain as standalone consts pending real
per-viewer rank tracker. One test updated, one new test added.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.BattleNode/Lifecycle/ScriptedLifecycle.cs

@@ -38,12 +38,17 @@ public static class ScriptedLifecycle
                 SelfDeck: BuildPlayerDeck(ctx.SelfDeckCardIds)),
             bid: battleId);
 
-    public static MsgEnvelope BuildBattleStart(long playerViewerId) =>
+    public static MsgEnvelope BuildBattleStart(MatchContext ctx, long playerViewerId) =>
         EnvelopeForPush(NetworkBattleUri.BattleStart,
             new BattleStartBody(
                 TurnState: 0,    // player goes first
-                BattleType: 11,  // TK2 NetworkBattleType
-                SelfInfo: ScriptedProfiles.PlayerBattleStartProfile,
+                BattleType: ctx.BattleType,
+                SelfInfo: new BattleStartSelfInfo(
+                    Rank: ScriptedProfiles.PlayerRank,
+                    BattlePoint: ScriptedProfiles.PlayerBattlePoint,
+                    ClassId: ctx.ClassId,
+                    CharaId: ctx.CharaId,
+                    CardMasterName: ctx.CardMasterName),
                 OppoInfo: ScriptedProfiles.OpponentBattleStartProfile));
 
     public static MsgEnvelope BuildDeal() =>

SVSim.BattleNode/Lifecycle/ScriptedProfiles.cs

@@ -27,13 +27,10 @@ internal static class ScriptedProfiles
         Seed: BattleSeed,
         OppoDeckCount: 30);
 
-    // From frame[5] (BattleStart).
-    public static readonly BattleStartSelfInfo PlayerBattleStartProfile = new(
-        Rank: "10",
-        BattlePoint: "6270",
-        ClassId: "1",
-        CharaId: "1",
-        CardMasterName: "card_master_node_10015");
+    // From frame[5] (BattleStart). Hardcoded; see spec §Deferred plumbing — sourcing these
+    // from real per-viewer state needs a TK2 rank/battle-point tracker.
+    public const string PlayerRank = "10";
+    public const string PlayerBattlePoint = "6270";
 
     public static readonly BattleStartOppoInfo OpponentBattleStartProfile = new(
         Rank: "1",

SVSim.BattleNode/Sessions/BattleSession.cs

@@ -239,7 +239,7 @@ public sealed class BattleSession
                 Phase = BattleSessionPhase.AwaitingLoaded;
                 break;
             case NetworkBattleUri.Loaded when Phase == BattleSessionPhase.AwaitingLoaded:
-                result.Add((ScriptedLifecycle.BuildBattleStart(ViewerId), NoStock: false));
+                result.Add((ScriptedLifecycle.BuildBattleStart(Context, ViewerId), NoStock: false));
                 result.Add((ScriptedLifecycle.BuildDeal(), NoStock: false));
                 Phase = BattleSessionPhase.AwaitingSwap;
                 break;