feat(battle-engine): ParticleSystem/Collider2D/Quaternion + SocketOptions members (1462->1386)

ParticleSystem.MainModule (playOnAwake/simulationSpeed/startColor + MinMaxGradient),
ParticleSystemRenderer (maskInteraction/trailMaterial + SpriteMaskInteraction), BoxCollider2D
(isTrigger/offset/size), Quaternion.FromToRotation/Inverse. SocketOptions (AutoConnect/
ConnectWith/AdditionalQueryParams) + PlatformSupport ObservableDictionary.

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

SVSim.BattleEngine/Shim/External/SdkStubs.cs

@@ -73,7 +73,11 @@ namespace Spine.Unity
 
 // ---- misc third-party namespaces (anchors) ----
 namespace RedShellUnity { internal class _ShimAnchor { } }
-namespace PlatformSupport.Collections.ObjectModel { internal class _ShimAnchor { } }
+namespace PlatformSupport.Collections.ObjectModel
+{
+    public class ObservableDictionary<TKey, TValue> : System.Collections.Generic.Dictionary<TKey, TValue> { }
+    internal class _ShimAnchor { }
+}
 namespace Convention { internal class _ShimAnchor { } }
 namespace com.adjust.sdk { internal class _ShimAnchor { } }
 namespace BestHTTP.Decompression { internal class _ShimAnchor { } }

SVSim.BattleEngine/Shim/UnityEngine/Primitives.cs

@@ -78,6 +78,8 @@ namespace UnityEngine
         public static Quaternion AngleAxis(float angle, Vector3 axis) => identity;
         public static Quaternion LookRotation(Vector3 fwd) => identity;
         public static Quaternion Slerp(Quaternion a, Quaternion b, float t) => identity;
+        public static Quaternion FromToRotation(Vector3 from, Vector3 to) => identity;
+        public static Quaternion Inverse(Quaternion rotation) => identity;
         public Vector3 eulerAngles { get => Vector3.zero; set { } }
         public static Vector3 operator *(Quaternion q, Vector3 v) => v;
         public static Quaternion operator *(Quaternion a, Quaternion b) => identity;

SVSim.BattleEngine/Shim/UnityEngine/UnityShim.cs

@@ -226,11 +226,13 @@ namespace UnityEngine
         public EmissionModule emission => default;
         public int GetParticles(Particle[] p) => 0;
         public void SetParticles(Particle[] p, int n) { }
-        public struct MainModule { public float duration; public float startLifetime; public bool loop; public float startSpeed; }
+        public struct MainModule { public float duration; public float startLifetime; public bool loop; public float startSpeed; public bool playOnAwake; public float simulationSpeed; public MinMaxGradient startColor; }
+        public struct MinMaxGradient { public Color color; public MinMaxGradient(Color c) { color = c; } public static implicit operator MinMaxGradient(Color c) => new MinMaxGradient(c); }
         public struct EmissionModule { public bool enabled; public float rateOverTime; }
         public struct Particle { public Vector3 position; public Vector3 velocity; public Color32 startColor; public float remainingLifetime; }
     }
-    public class ParticleSystemRenderer : Renderer { }
+    public class ParticleSystemRenderer : Renderer { public SpriteMaskInteraction maskInteraction { get; set; } public Material trailMaterial { get; set; } }
+    public enum SpriteMaskInteraction { None, VisibleInsideMask, VisibleOutsideMask }
     public partial class LODGroup : Component { }
     public class Collider : Component { public bool enabled { get; set; } }
     public class BoxCollider : Collider { public Vector3 size { get; set; } public Vector3 center { get; set; } public bool isTrigger { get; set; } }

SVSim.BattleEngine/Shim/UnityEngine/UnityShim2.cs

@@ -36,7 +36,7 @@ namespace UnityEngine
     public class AssetBundleRequest : AsyncOperation { public Object asset => null; public Object[] allAssets => new Object[0]; }
 
     public class Collider2D : Component { public bool enabled { get; set; } }
-    public partial class BoxCollider2D : Collider2D { }
+    public partial class BoxCollider2D : Collider2D { public bool isTrigger { get; set; } public Vector2 offset { get; set; } public Vector2 size { get; set; } }
     public partial class Light : Behaviour { }
     public class AudioListener : Behaviour { }
 

SVSim.BattleEngine/Shim/View/SettingsUiStubs.cs

@@ -118,7 +118,12 @@ namespace BestHTTP.SocketIO
         public Socket Off() => this;
         public Socket Emit(string eventName, params object[] args) => this;
     }
-    public class SocketOptions { }
+    public class SocketOptions
+    {
+        public bool AutoConnect { get; set; }
+        public Transports.TransportTypes ConnectWith { get; set; }
+        public PlatformSupport.Collections.ObjectModel.ObservableDictionary<string, string> AdditionalQueryParams { get; set; }
+    }
     public sealed class SocketManager
     {
         public enum States { Initial, Opening, Open, Paused, Pausing, Reconnecting, Closed }