feat: add channel enable/disable, prefab docs, and UI updates

Add per-channel enable/disable toggle to the in-game logging system
with Enable()/Disable() on InGameLogger and EnableChannel/DisableChannel
on IGameLogStore. Update README with prefab setup guide and enable/disable
documentation. Update character creation and log container prefabs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Packages/com.jovian.ingame-logging/Runtime/GameLogStore.cs

@@ -5,6 +5,7 @@ using UnityEngine;
 namespace Jovian.InGameLogging {
     public sealed class GameLogStore : IGameLogStore {
         readonly LogEntry[] buffer;
+        readonly HashSet<LogChannel> disabledChannels = new();
         int head;
         int count;
 
@@ -21,6 +22,9 @@ namespace Jovian.InGameLogging {
         }
 
         public void Add(LogChannel channel, string message) {
+            if(disabledChannels.Contains(channel)) {
+                return;
+            }
             var entry = new LogEntry(message, channel, Time.time);
             buffer[head] = entry;
             head = (head + 1) % buffer.Length;
@@ -30,6 +34,18 @@ namespace Jovian.InGameLogging {
             OnEntryAdded?.Invoke(entry);
         }
 
+        public void EnableChannel(LogChannel channel) {
+            disabledChannels.Remove(channel);
+        }
+
+        public void DisableChannel(LogChannel channel) {
+            disabledChannels.Add(channel);
+        }
+
+        public bool IsChannelEnabled(LogChannel channel) {
+            return !disabledChannels.Contains(channel);
+        }
+
         public void Clear() {
             head = 0;
             count = 0;

Packages/com.jovian.ingame-logging/Runtime/IGameLogStore.cs

@@ -7,6 +7,9 @@ namespace Jovian.InGameLogging {
         int Capacity { get; }
 
         void Add(LogChannel channel, string message);
+        void EnableChannel(LogChannel channel);
+        void DisableChannel(LogChannel channel);
+        bool IsChannelEnabled(LogChannel channel);
         void Clear();
         void Clear(LogChannel channel);
 

Packages/com.jovian.ingame-logging/Runtime/InGameLogger.cs

@@ -19,5 +19,17 @@ namespace Jovian.InGameLogging {
         public void Log(string message, string hexColor) {
             store.Add(channel, $"<color={hexColor}>{message}</color>");
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Enable() {
+            store.EnableChannel(channel);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public void Disable() {
+            store.DisableChannel(channel);
+        }
+
+        public bool IsEnabled => store.IsChannelEnabled(channel);
     }
 }

Packages/com.jovian.ingame-logging/Runtime/LogChannel.cs

@@ -4,7 +4,7 @@ using UnityEngine;
 namespace Jovian.InGameLogging {
     [Serializable]
     public readonly struct LogChannel : IEquatable<LogChannel> {
-        [SerializeField] readonly string id;
+        private readonly string id;
 
         public string Id => id;