don't apply traits for borg and ai (#31990)

* doesn't apply traits for borg or ai

* add some comment and summaries

* weh

weh

* well ok

Co-authored-by: Ed <96445749+TheShuEd@users.noreply.github.com>

---------

Co-authored-by: Ed <96445749+TheShuEd@users.noreply.github.com>

Content.Server/Traits/TraitSystem.cs

@@ -1,6 +1,7 @@
 using Content.Server.GameTicking;
 using Content.Shared.Hands.Components;
 using Content.Shared.Hands.EntitySystems;
+using Content.Shared.Roles;
 using Content.Shared.Traits;
 using Content.Shared.Whitelist;
 using Robust.Shared.Prototypes;
@@ -24,6 +25,14 @@ public sealed class TraitSystem : EntitySystem
     // When the player is spawned in, add all trait components selected during character creation
     private void OnPlayerSpawnComplete(PlayerSpawnCompleteEvent args)
     {
+        // Check if player's job allows to apply traits
+        if (args.JobId == null ||
+            !_prototypeManager.TryIndex<JobPrototype>(args.JobId ?? string.Empty, out var protoJob) ||
+            !protoJob.ApplyTraits)
+        {
+            return;
+        }
+
         foreach (var traitId in args.Profile.TraitPreferences)
         {
             if (!_prototypeManager.TryIndex<TraitPrototype>(traitId, out var traitPrototype))