feat: runtime familiarity from shared work and utility exposure

NPCs who target the same resource or site concurrently gain mutual familiarity +0.1 per encounter, capped at 1.0. Action selection now receives the full NPC array and adds a +0.3 utility bonus for actions that familiar NPCs are currently performing - NPCs gravitate toward their housemates' professions. Inspector shows the highest-familiarity NPC with a percentage score under the resource lines.

simulation/SimulationManager.gd

@@ -127,7 +127,7 @@ func simulate_tick() -> void:
 			and old_state in [SimNPC.TASK_STATE_IDLE, SimNPC.TASK_STATE_COMPLETE]
 			and npc.task_state in [SimNPC.TASK_STATE_IDLE, SimNPC.TASK_STATE_COMPLETE]
 		):
-			var selection := action_selector.select_action(npc, village, clock.time_of_day())
+			var selection := action_selector.select_action(npc, village, clock.time_of_day(), npcs)
 			if selection != null:
 				latest_decisions[npc.id] = selection
 				npc_decision_recorded.emit(npc, selection)
@@ -360,6 +360,23 @@ func notify_npc_arrived(npc_id: int) -> void:
 				npc.has_travel_target = false
 				npc.start_working()
 
+				if npc.target_id != &"":
+					for other in npcs:
+						if other.id == npc.id or other.is_dead:
+							continue
+						if (
+							other.target_id == npc.target_id
+							and other.task_state in [
+								SimNPC.TASK_STATE_TRAVELING, SimNPC.TASK_STATE_WORKING
+							]
+						):
+							npc.familiarity[other.id] = minf(
+								float(npc.familiarity.get(other.id, 0.0)) + 0.1, 1.0
+							)
+							other.familiarity[npc.id] = minf(
+								float(other.familiarity.get(npc.id, 0.0)) + 0.1, 1.0
+							)
+
 				if debug_logs:
 					print(
 						"[SimulationManager] ",