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/ChatController.cs

@@ -0,0 +1,51 @@
+using UnityEngine;
+using UnityEngine.UI;
+using TMPro;
+
+public class ChatController : MonoBehaviour {
+
+
+    public TMP_InputField ChatInputField;
+
+    public TMP_Text ChatDisplayOutput;
+
+    public Scrollbar ChatScrollbar;
+
+    void OnEnable()
+    {
+        ChatInputField.onSubmit.AddListener(AddToChatOutput);
+    }
+
+    void OnDisable()
+    {
+        ChatInputField.onSubmit.RemoveListener(AddToChatOutput);
+    }
+
+
+    void AddToChatOutput(string newText)
+    {
+        // Clear Input Field
+        ChatInputField.text = string.Empty;
+
+        var timeNow = System.DateTime.Now;
+
+        string formattedInput = "[<#FFFF80>" + timeNow.Hour.ToString("d2") + ":" + timeNow.Minute.ToString("d2") + ":" + timeNow.Second.ToString("d2") + "</color>] " + newText;
+
+        if (ChatDisplayOutput != null)
+        {
+            // No special formatting for first entry
+            // Add line feed before each subsequent entries
+            if (ChatDisplayOutput.text == string.Empty)
+                ChatDisplayOutput.text = formattedInput;
+            else
+                ChatDisplayOutput.text += "\n" + formattedInput;
+        }
+
+        // Keep Chat input field active
+        ChatInputField.ActivateInputField();
+
+        // Set the scrollbar to the bottom when next text is submitted.
+        ChatScrollbar.value = 0;
+    }
+
+}