Warmup-safe skill assignment, PerfLog header

- Treat null GameRules as "not ready" so skills are never assigned during
  warmup right after plugin load/hot-reload (SetSkill + RoundStart)
- PerfLog writes a header line on first measurement so the perf file
  appears immediately when PerfMode is active

jRandomSkills - SRC Files/jRandomSkills.csproj

@@ -71,7 +71,9 @@
         <Message Text="Copying compiled DLL from $(SourceDLL) to $(ServerDLL)" Importance="High" />
         <ItemGroup>
             <CompiledDLL Include="$(SourceDLL)\jRandomSkills.dll" />
+            <CompiledDLL Include="$(SourceDLL)\jRandomSkills.pdb" />
             <CompiledDLL Include="$(SourceDLL)\WASDMenuAPI.dll" />
+            <CompiledDLL Include="$(SourceDLL)\WASDMenuAPI.pdb" />
 	        <CompiledDLL Include="$(SourceDLL)\MaxMind.Db.dll" />
 	        <CompiledDLL Include="$(SourceDLL)\Newtonsoft.Json.dll" />
         </ItemGroup>

jRandomSkills - SRC Files/src/player/PerfLog.cs

@@ -14,7 +14,22 @@ namespace src.player
 
         public static bool Enabled => Config.LoadedConfig.PerfMode;
 
-        public static long Start() => Enabled ? Stopwatch.GetTimestamp() : 0;
+        private static bool _headerWritten;
+
+        public static long Start()
+        {
+            if (!Enabled) return 0;
+
+            // Write a header on the first measurement so the perf file appears immediately
+            // when PerfMode is active - makes "is it working?" instantly visible.
+            if (!_headerWritten)
+            {
+                _headerWritten = true;
+                Write($"PerfMode enabled (plugin v{Instance.ModuleVersion})");
+            }
+
+            return Stopwatch.GetTimestamp();
+        }
 
         // One-shot measurement: logs "label took X.XXms" when the elapsed time reaches the threshold.
         public static void End(string label, long startTimestamp, double thresholdMs = 1.0)

jRandomSkills - SRC Files/src/player/PlayerEvents.cs

@@ -595,7 +595,7 @@ namespace src.player
         {
             lock (setLock)
             {
-                bool isWarmup = Instance.GameRules != null && Instance.GameRules.WarmupPeriod == true;
+                bool isWarmup = Instance.GameRules == null || Instance.GameRules.WarmupPeriod == true;
                 isTransmitRegistered = false;
                 Instance.AddTimer(.1f, () => DisableAll(), CounterStrikeSharp.API.Modules.Timers.TimerFlags.STOP_ON_MAPCHANGE);
 
@@ -877,7 +877,9 @@ namespace src.player
             {
                 if (Instance == null) return;
 
-                if (Instance.GameRules != null && Instance.GameRules.WarmupPeriod == true)
+                // GameRules can be null for a short window right after plugin load/hot-reload;
+                // treat that as "not ready" so skills are never assigned during warmup by accident.
+                if (Instance.GameRules == null || Instance.GameRules.WarmupPeriod == true)
                 {
                     setSkillTimer?.Kill();
                     return;