feat: add Unity 6 client with 2.5D visual system

Unity client features:
- WebSocket connection via NativeWebSocket
- 2.5D agent visuals with programmatic placeholder sprites
- Billboard system for sprites and UI elements
- Floating UI panels (name, HP, energy bars)
- Speech bubble system with pop-in animation
- RTS-style camera controller (WASD + scroll zoom)
- Editor tools for prefab creation and scene setup

Scripts:
- NetworkManager: WebSocket singleton
- GameManager: Agent spawning and event handling
- AgentVisual: 2.5D sprite and UI creation
- Billboard: Camera-facing behavior
- SpeechBubble: Animated dialogue display
- CameraController: RTS camera with UI input detection
- UIManager: HUD and command input

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

unity-client/Assets/TextMesh Pro/Examples & Extras/Scripts/ObjectSpin.cs

@@ -0,0 +1,67 @@
+using UnityEngine;
+using System.Collections;
+
+
+namespace TMPro.Examples
+{
+
+    public class ObjectSpin : MonoBehaviour
+    {
+        #pragma warning disable 0414
+        public enum MotionType { Rotation, SearchLight, Translation };
+        public MotionType Motion;
+
+        public Vector3 TranslationDistance = new Vector3(5, 0, 0);
+        public float TranslationSpeed = 1.0f;
+        public float SpinSpeed = 5;
+        public int RotationRange = 15;
+        private Transform m_transform;
+
+        private float m_time;
+        private Vector3 m_prevPOS;
+        private Vector3 m_initial_Rotation;
+        private Vector3 m_initial_Position;
+        private Color32 m_lightColor;
+
+        void Awake()
+        {
+            m_transform = transform;
+            m_initial_Rotation = m_transform.rotation.eulerAngles;
+            m_initial_Position = m_transform.position;
+
+            Light light = GetComponent<Light>();
+            m_lightColor = light != null ? light.color : Color.black;
+        }
+
+
+        // Update is called once per frame
+        void Update()
+        {
+            switch (Motion)
+            {
+                case MotionType.Rotation:
+                    m_transform.Rotate(0, SpinSpeed * Time.deltaTime, 0);
+                    break;
+                case MotionType.SearchLight:
+                    m_time += SpinSpeed * Time.deltaTime;
+                    m_transform.rotation = Quaternion.Euler(m_initial_Rotation.x, Mathf.Sin(m_time) * RotationRange + m_initial_Rotation.y, m_initial_Rotation.z);
+                    break;
+                case MotionType.Translation:
+                    m_time += TranslationSpeed * Time.deltaTime;
+
+                    float x = TranslationDistance.x * Mathf.Cos(m_time);
+                    float y = TranslationDistance.y * Mathf.Sin(m_time) * Mathf.Cos(m_time * 1f);
+                    float z = TranslationDistance.z * Mathf.Sin(m_time);
+
+                    m_transform.position = m_initial_Position + new Vector3(x, z, y);
+
+                    // Drawing light patterns because they can be cool looking.
+                    //if (Time.frameCount > 1)
+                    //    Debug.DrawLine(m_transform.position, m_prevPOS, m_lightColor, 100f);
+
+                    m_prevPOS = m_transform.position;
+                    break;
+            }
+        }
+    }
+}