Send no guild for static trainers on the wire

Live static trainers carried no guild in 2,110 of 2,110 sightings, in
buildings too; slotted ones showed their CITY building's guild tag (e.g.
Nathokk in King's Cross). npc.guild keeps the building's guild for
server-side checks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/NPC.java

@@ -330,9 +330,12 @@ public class NPC extends AbstractCharacter {
         writer.putInt(0);
         writer.put((byte) 0);
 
-        //Pull guild info from building if linked to one
-
-        Guild.serializeForClientMsg(npc.guild, writer, null, true);
+        // Live static trainers sent no guild, even when slotted in a guild's building (2,110 of 2,110 sightings);
+        // npc.guild still holds the building's guild for the server's own checks.
+        if (npc.isStaticWorldObject())
+            Guild.serializeForClientMsg(Guild.getErrantGuild(), writer, null, true);
+        else
+            Guild.serializeForClientMsg(npc.guild, writer, null, true);
 
         writer.putInt(1);
         writer.putInt(0x8A2E);