port(m1): wave 6g — CS1061 member cluster (304->236)

- Friend.PlayerData full-surface generated (18 members) + hand stub -> partial.
- Wizard.RoomMatch.Player: 7 friend-info props (ViewerId/Name/Rank/Emblem/Degree/Country/IsFriend).
- GameMgr: HasAuthAdmin, ChangeAspectRatio(float), Update().
- Cute.SceneManager: ChangeScene overloads + SceneChangeParameter (+SceneChangeParameter stub).
- UnityEngine.SceneManagement.SceneManager + Scene; RedShellSDK.RedShellSDK statics.
- Packet.Attachments; Vector2.Dot/Angle/Normalize.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/UnityEngine/Primitives.cs

@@ -20,6 +20,9 @@ namespace UnityEngine
         public float sqrMagnitude => x * x + y * y;
         public Vector2 normalized { get { float m = magnitude; return m > 1e-6f ? new Vector2(x / m, y / m) : zero; } }
         public static float Distance(Vector2 a, Vector2 b) => (a - b).magnitude;
+        public static float Dot(Vector2 a, Vector2 b) => a.x * b.x + a.y * b.y;
+        public static float Angle(Vector2 from, Vector2 to) => 0f;
+        public void Normalize() { var n = normalized; x = n.x; y = n.y; }
         public static Vector2 Lerp(Vector2 a, Vector2 b, float t) => new Vector2(a.x + (b.x - a.x) * t, a.y + (b.y - a.y) * t);
         public static Vector2 operator +(Vector2 a, Vector2 b) => new Vector2(a.x + b.x, a.y + b.y);
         public static Vector2 operator -(Vector2 a, Vector2 b) => new Vector2(a.x - b.x, a.y - b.y);

SVSim.BattleEngine/Shim/UnityEngine/UnityShim2.cs

@@ -58,7 +58,19 @@ namespace UnityEngine
 // Sub-namespace anchors (referenced via `using`; types unmask in later waves if used).
 namespace UnityEngine.Experimental { internal class _ShimAnchor { } }
 namespace UnityEngine.Experimental.Rendering { internal class _ShimAnchor { } }
-namespace UnityEngine.SceneManagement { internal class _ShimAnchor { } }
+namespace UnityEngine.SceneManagement
+{
+    internal class _ShimAnchor { }
+    public struct Scene { public string name => ""; public int buildIndex => 0; public bool IsValid() => false; public bool isLoaded => false; }
+    public static class SceneManager
+    {
+        public static void LoadScene(string sceneName) { }
+        public static void LoadScene(int sceneBuildIndex) { }
+        public static Scene GetActiveScene() => default;
+        public static Scene GetSceneByName(string name) => default;
+        public static int sceneCount => 0;
+    }
+}
 namespace UnityEngine.SocialPlatforms
 {
     // NOTE: no IAchievementCallback here -- the engine's AchievementImpl uses