Wire corpse spawning into combat death handling

When a mob dies in combat, create_corpse is called to spawn a corpse
at the mob's position with the mob's inventory transferred. This
replaces the direct despawn_mob call, making combat deaths leave
lootable corpses behind.

The fallback to despawn_mob is kept if the mob somehow has no zone.

src/mudlib/combat/engine.py

@@ -170,6 +170,13 @@ async def process_combat() -> None:
 
                 # Despawn mob losers, send victory/defeat messages
                 if isinstance(loser, Mob):
+                    from mudlib.corpse import create_corpse
+                    from mudlib.zone import Zone
+
+                    zone = loser.location
+                    if isinstance(zone, Zone):
+                        create_corpse(loser, zone)
+                    else:
                         from mudlib.mobs import despawn_mob
 
                         despawn_mob(loser)

tests/test_corpse.py

@@ -216,3 +216,193 @@ class TestCorpseAsContainer:
 
         dummy_entity = Entity(name="dummy", x=0, y=0, location=test_zone)
         assert dummy_entity.can_accept(corpse) is False
+
+
+class TestCombatDeathCorpse:
+    """Tests for corpse spawning when a mob dies in combat."""
+
+    @pytest.mark.asyncio
+    async def test_mob_death_in_combat_spawns_corpse(self, test_zone):
+        """Mob death in combat spawns a corpse at mob's position."""
+        from mudlib.combat.encounter import CombatState
+        from mudlib.combat.engine import (
+            active_encounters,
+            process_combat,
+            start_encounter,
+        )
+        from mudlib.combat.moves import CombatMove
+        from mudlib.entity import Entity
+
+        # Clear active encounters
+        active_encounters.clear()
+
+        # Create a weak mob
+        mob = Mob(
+            name="goblin",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=1.0,
+            stamina=40.0,
+        )
+        mobs.append(mob)
+
+        # Create attacker
+        attacker = Entity(
+            name="hero",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=100.0,
+            stamina=50.0,
+        )
+
+        # Start encounter
+        encounter = start_encounter(attacker, mob)
+
+        # Set up a lethal move
+        punch = CombatMove(
+            name="punch right",
+            move_type="attack",
+            stamina_cost=5.0,
+            timing_window_ms=800,
+            damage_pct=0.15,
+            countered_by=["dodge left"],
+        )
+        encounter.attack(punch)
+        encounter.state = CombatState.RESOLVE
+
+        # Process combat to trigger resolve
+        await process_combat()
+
+        # Check for corpse at mob's position
+        corpses = [
+            obj for obj in test_zone.contents_at(5, 10) if isinstance(obj, Corpse)
+        ]
+        assert len(corpses) == 1
+        assert corpses[0].name == "goblin's corpse"
+
+    @pytest.mark.asyncio
+    async def test_mob_death_transfers_inventory_to_corpse(self, test_zone, sword):
+        """Mob death transfers inventory to corpse."""
+        from mudlib.combat.encounter import CombatState
+        from mudlib.combat.engine import (
+            active_encounters,
+            process_combat,
+            start_encounter,
+        )
+        from mudlib.combat.moves import CombatMove
+        from mudlib.entity import Entity
+
+        # Clear active encounters
+        active_encounters.clear()
+
+        # Create a weak mob with inventory
+        mob = Mob(
+            name="goblin",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=1.0,
+            stamina=40.0,
+        )
+        mobs.append(mob)
+        sword.move_to(mob)
+
+        # Create attacker
+        attacker = Entity(
+            name="hero",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=100.0,
+            stamina=50.0,
+        )
+
+        # Start encounter and kill mob
+        encounter = start_encounter(attacker, mob)
+        punch = CombatMove(
+            name="punch right",
+            move_type="attack",
+            stamina_cost=5.0,
+            timing_window_ms=800,
+            damage_pct=0.15,
+            countered_by=["dodge left"],
+        )
+        encounter.attack(punch)
+        encounter.state = CombatState.RESOLVE
+
+        # Process combat
+        await process_combat()
+
+        # Find corpse
+        corpses = [
+            obj for obj in test_zone.contents_at(5, 10) if isinstance(obj, Corpse)
+        ]
+        assert len(corpses) == 1
+        corpse = corpses[0]
+
+        # Verify sword is in corpse
+        assert sword in corpse._contents
+        assert sword.location is corpse
+
+    @pytest.mark.asyncio
+    async def test_corpse_appears_in_zone_contents(self, test_zone):
+        """Corpse appears in zone.contents_at after mob death."""
+        from mudlib.combat.encounter import CombatState
+        from mudlib.combat.engine import (
+            active_encounters,
+            process_combat,
+            start_encounter,
+        )
+        from mudlib.combat.moves import CombatMove
+        from mudlib.entity import Entity
+
+        # Clear active encounters
+        active_encounters.clear()
+
+        # Create a weak mob
+        mob = Mob(
+            name="goblin",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=1.0,
+            stamina=40.0,
+        )
+        mobs.append(mob)
+
+        # Create attacker
+        attacker = Entity(
+            name="hero",
+            x=5,
+            y=10,
+            location=test_zone,
+            pl=100.0,
+            stamina=50.0,
+        )
+
+        # Start encounter and kill mob
+        encounter = start_encounter(attacker, mob)
+        punch = CombatMove(
+            name="punch right",
+            move_type="attack",
+            stamina_cost=5.0,
+            timing_window_ms=800,
+            damage_pct=0.15,
+            countered_by=["dodge left"],
+        )
+        encounter.attack(punch)
+        encounter.state = CombatState.RESOLVE
+
+        # Process combat
+        await process_combat()
+
+        # Verify corpse is in zone contents
+        contents = list(test_zone.contents_at(5, 10))
+        corpse_count = sum(1 for obj in contents if isinstance(obj, Corpse))
+        assert corpse_count == 1
+
+        # Verify it's the goblin's corpse
+        corpse = next(obj for obj in contents if isinstance(obj, Corpse))
+        assert corpse.name == "goblin's corpse"