Replace magic number with DEATH_PL constant

src/mudlib/commands/snapneck.py

@@ -4,6 +4,8 @@ from mudlib.combat.engine import end_encounter, get_encounter
 from mudlib.commands import CommandDefinition, register
 from mudlib.player import Player, players
 
+DEATH_PL = -100.0
+
 
 async def cmd_snap_neck(player: Player, args: str) -> None:
     """Snap the neck of an unconscious target.
@@ -52,7 +54,7 @@ async def cmd_snap_neck(player: Player, args: str) -> None:
         return
 
     # Execute the finisher
-    target.pl = -100.0  # Instant death
+    target.pl = DEATH_PL
 
     # Send dramatic messages
     await player.send(f"You snap {target.name}'s neck!\r\n")