feat: add gameplay enhancements and visual improvements

Backend:
- Add weather system with 6 weather types and transition probabilities
- Add day/night cycle (dawn, day, dusk, night) with phase modifiers
- Add mood system for agents (happy, neutral, sad, anxious)
- Add new commands: heal, talk, encourage, revive
- Add agent social interaction system with relationships
- Add casual mode with auto-revive and reduced decay rates

Frontend (Web):
- Add world state display (weather, time of day)
- Add mood bar to agent cards
- Add new action buttons for heal, encourage, talk, revive
- Handle new event types from server

Unity Client:
- Add EnvironmentManager with dynamic sky gradient and island scene
- Add WeatherEffects with rain, sun rays, fog, and heat particles
- Add SceneBootstrap for automatic visual system initialization
- Improve AgentVisual with better character sprites and animations
- Add breathing and bobbing idle animations
- Add character shadows
- Improve UI panels with rounded corners and borders
- Improve SpeechBubble with rounded corners and proper tail
- Add support for all new server events and commands

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

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

unity-client/Assets/Scripts/Visual/SceneBootstrap.cs

@@ -0,0 +1,95 @@
+using UnityEngine;
+
+namespace TheIsland.Visual
+{
+    /// <summary>
+    /// Bootstraps the scene with all visual components.
+    /// Attach this to an empty GameObject in your scene to automatically
+    /// create the environment, weather effects, and other visual systems.
+    /// </summary>
+    public class SceneBootstrap : MonoBehaviour
+    {
+        [Header("Auto-Create Components")]
+        [SerializeField] private bool createEnvironment = true;
+        [SerializeField] private bool createWeatherEffects = true;
+
+        [Header("Camera Settings")]
+        [SerializeField] private bool configureCamera = true;
+        [SerializeField] private Vector3 cameraPosition = new Vector3(0, 3, -8);
+        [SerializeField] private Vector3 cameraRotation = new Vector3(15, 0, 0);
+        [SerializeField] private float cameraFieldOfView = 60f;
+
+        private void Awake()
+        {
+            // Configure camera
+            if (configureCamera)
+            {
+                ConfigureMainCamera();
+            }
+
+            // Create environment
+            if (createEnvironment && EnvironmentManager.Instance == null)
+            {
+                CreateEnvironmentManager();
+            }
+
+            // Create weather effects
+            if (createWeatherEffects && WeatherEffects.Instance == null)
+            {
+                CreateWeatherEffects();
+            }
+
+            Debug.Log("[SceneBootstrap] Visual systems initialized");
+        }
+
+        private void ConfigureMainCamera()
+        {
+            Camera mainCamera = Camera.main;
+            if (mainCamera == null)
+            {
+                var camObj = new GameObject("Main Camera");
+                mainCamera = camObj.AddComponent<Camera>();
+                camObj.AddComponent<AudioListener>();
+                camObj.tag = "MainCamera";
+            }
+
+            mainCamera.transform.position = cameraPosition;
+            mainCamera.transform.rotation = Quaternion.Euler(cameraRotation);
+            mainCamera.fieldOfView = cameraFieldOfView;
+            mainCamera.clearFlags = CameraClearFlags.SolidColor;
+            mainCamera.backgroundColor = new Color(0.4f, 0.6f, 0.9f); // Fallback sky color
+
+            Debug.Log("[SceneBootstrap] Camera configured");
+        }
+
+        private void CreateEnvironmentManager()
+        {
+            var envObj = new GameObject("EnvironmentManager");
+            envObj.AddComponent<EnvironmentManager>();
+            Debug.Log("[SceneBootstrap] EnvironmentManager created");
+        }
+
+        private void CreateWeatherEffects()
+        {
+            var weatherObj = new GameObject("WeatherEffects");
+            weatherObj.AddComponent<WeatherEffects>();
+            Debug.Log("[SceneBootstrap] WeatherEffects created");
+        }
+
+        /// <summary>
+        /// Call this to manually refresh all visual systems.
+        /// </summary>
+        public void RefreshVisuals()
+        {
+            if (EnvironmentManager.Instance != null)
+            {
+                EnvironmentManager.Instance.SetEnvironment("day", "Sunny");
+            }
+
+            if (WeatherEffects.Instance != null)
+            {
+                WeatherEffects.Instance.SetWeather("Sunny");
+            }
+        }
+    }
+}