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/ShaderPropAnimator.cs

@@ -0,0 +1,51 @@
+using UnityEngine;
+using System.Collections;
+
+
+namespace TMPro.Examples
+{
+    
+    public class ShaderPropAnimator : MonoBehaviour
+    {
+
+        private Renderer m_Renderer;
+        private Material m_Material;
+
+        public AnimationCurve GlowCurve;
+
+        public float m_frame;
+
+        void Awake()
+        {
+            // Cache a reference to object's renderer
+            m_Renderer = GetComponent<Renderer>();
+
+            // Cache a reference to object's material and create an instance by doing so.
+            m_Material = m_Renderer.material;
+        }
+
+        void Start()
+        {
+            StartCoroutine(AnimateProperties());
+        }
+
+        IEnumerator AnimateProperties()
+        {
+            //float lightAngle;
+            float glowPower;
+            m_frame = Random.Range(0f, 1f);
+
+            while (true)
+            {
+                //lightAngle = (m_Material.GetFloat(ShaderPropertyIDs.ID_LightAngle) + Time.deltaTime) % 6.2831853f;
+                //m_Material.SetFloat(ShaderPropertyIDs.ID_LightAngle, lightAngle);
+
+                glowPower = GlowCurve.Evaluate(m_frame);
+                m_Material.SetFloat(ShaderUtilities.ID_GlowPower, glowPower);
+
+                m_frame += Time.deltaTime * Random.Range(0.2f, 0.3f);
+                yield return new WaitForEndOfFrame();
+            }
+        }
+    }
+}