feat: starvation balance rework and Ghibli wind-stroke visuals

- Reduce hunger rate to 0.125/tick (~25/day) for ~6-7 day death timeline
- Slow energy drain: idle 0.125, travel 0.5, work 0.5, complete 0.0625/tick
- Use exact binary fractions for all rates to preserve float precision in save/load
- Starving/critically-hungry NPCs always override sleep to seek food first
- Extend starvation death threshold from 20 to 600 ticks (~3 days of starvation)
- Add calligraphy-style wind stroke particles (WindStrokes scene + shader)
- Two wind stroke emitters in valley and ridge for Ghibli atmosphere
- Rework terrain macro-variation colors for vibrant warm-green palette
- Enhance environment: stronger glow/bloom, higher saturation, warmer sky/fog/ambient

simulation/actions/ActionExecutionSystem.gd

@@ -15,19 +15,21 @@ func advance_npc(npc: SimNPC, village: SimVillage) -> void:
 
 
 func _update_needs(npc: SimNPC, village: SimVillage) -> void:
-	npc.hunger += 3.0 * village.food_modifier
+	npc.hunger += 0.125 * village.food_modifier
 	match npc.task_state:
 		SimNPC.TASK_STATE_IDLE:
-			npc.energy -= 0.5
+			npc.energy -= 0.125
 		SimNPC.TASK_STATE_TRAVELING:
-			npc.energy -= 2.0
+			npc.energy -= 0.5
 		SimNPC.TASK_STATE_WORKING:
 			if npc.current_task == SimulationIds.ACTION_SLEEP:
-				npc.energy = minf(npc.energy + 5.0, 100.0)
-			elif npc.current_task != SimulationIds.ACTION_REST:
-				npc.energy -= 3.0
+				npc.energy = minf(npc.energy + 1.0, 100.0)
+			elif npc.current_task == SimulationIds.ACTION_REST:
+				pass
+			else:
+				npc.energy -= 0.5
 		SimNPC.TASK_STATE_COMPLETE:
-			npc.energy -= 0.25
+			npc.energy -= 0.0625
 	npc.hunger = clamp(npc.hunger, 0.0, 100.0)
 	npc.energy = clamp(npc.energy, 0.0, 100.0)
 	npc.is_starving = npc.hunger >= 90.0