feat: NPC mourning behavior on housemate death

When an NPC dies from starvation, their highest-familiarity companion enters mourning for 100 ticks (~half a day). Mourning NPCs skip work: they rest if energy is low, otherwise wander near home. Mourning_ticks counts down each tick through ActionExecutionSystem and is serialized for save/load continuity with backward-compatible default of 0. This gives the familiarity graph its first behavioral consequence.

simulation/SimNPC.gd

@@ -33,6 +33,7 @@ var inventory: Dictionary = {}
 var last_task: StringName
 var random_source: RandomNumberGenerator
 var familiarity: Dictionary = {}
+var mourning_ticks := 0
 var debug_logs := true
 
 

simulation/SimulationManager.gd

@@ -149,6 +149,7 @@ func simulate_tick() -> void:
 			npc_died.emit(npc)
 			npc_task_changed.emit(npc, old_task, npc.current_task)
 			record_narrative_event(SimulationIds.EVENT_NPC_DIED, npc.id)
+			_notify_mourning(npc)
 
 			if debug_logs:
 				print("[SimulationManager] NPC died: ", npc.npc_name)
@@ -491,6 +492,30 @@ func _npc_inventory_id(npc_id: int) -> StringName:
 	return StringName("npc_%d_inventory" % npc_id)
 
 
+func _notify_mourning(dead_npc: SimNPC) -> void:
+	var best_id := -1
+	var best_score := -1.0
+	for key in dead_npc.familiarity:
+		var other_id: int = int(key)
+		var score: float = float(dead_npc.familiarity[key])
+		if score > best_score:
+			best_score = score
+			best_id = other_id
+	if best_id < 0:
+		return
+	for npc in npcs:
+		if npc.id == best_id and not npc.is_dead:
+			npc.mourning_ticks = 100
+			if debug_logs:
+				print(
+					"[SimulationManager] ",
+					npc.npc_name,
+					" is mourning ",
+					dead_npc.npc_name
+				)
+			return
+
+
 func _record_economic_event(
 	event_type: StringName,
 	actor_id: int,

simulation/actions/ActionExecutionSystem.gd

@@ -6,6 +6,8 @@ func advance_npc(npc: SimNPC, village: SimVillage) -> void:
 	if npc.is_dead:
 		return
 	_update_needs(npc, village)
+	if npc.mourning_ticks > 0:
+		npc.mourning_ticks -= 1
 	if npc.is_dead or npc.task_state != SimNPC.TASK_STATE_WORKING:
 		return
 	npc.task_progress += 1.0

simulation/actions/ActionSelectionSystem.gd

@@ -34,6 +34,14 @@ func select_action(npc: SimNPC, village: SimVillage, time_of_day: float = 0.5, a
 		return ActionSelectionResult.new(
 			SimulationIds.ACTION_GATHER_FOOD, -1.0, "Starving; must find food"
 		)
+	if npc.mourning_ticks > 0:
+		if npc.energy < 40.0:
+			return ActionSelectionResult.new(
+				SimulationIds.ACTION_REST, -1.0, "Mourning; seeking rest"
+			)
+		return ActionSelectionResult.new(
+			SimulationIds.ACTION_WANDER, -1.0, "Mourning; wandering near home"
+		)
 	if npc.hunger > 80.0:
 		if npc.get_inventory_amount(SimulationIds.RESOURCE_FOOD) >= 1.0:
 			return ActionSelectionResult.new(

simulation/state/NPCStateRecord.gd

@@ -46,7 +46,8 @@ static func capture(npc: SimNPC) -> NPCStateRecord:
 			"last_task": String(npc.last_task),
 			"random_seed": str(npc.random_source.seed),
 			"random_state": str(npc.random_source.state),
-			"familiarity": _sorted_familiarity(npc.familiarity)
+			"familiarity": _sorted_familiarity(npc.familiarity),
+			"mourning_ticks": npc.mourning_ticks
 		}
 	)
 
@@ -168,6 +169,7 @@ func restore(debug_logs: bool) -> SimNPC:
 			npc.familiarity[int(pair_dict["id"])] = float(pair_dict["score"])
 	elif saved_familiarity is Dictionary:
 		npc.familiarity = saved_familiarity.duplicate(true)
+	npc.mourning_ticks = int(data.get("mourning_ticks", 0))
 	return npc