perf: harden runtime for weaker hardware

simulation/state/CombatantStateRecord.gd

@@ -195,6 +195,18 @@ func set_hostile(value: bool) -> void:
 	changed.emit(self)
 
 
+func set_health_and_alive(value: float, alive: bool) -> void:
+	if not is_finite(value):
+		return
+	var next_health := clampf(value, 0.0, get_max_health()) if alive else 0.0
+	var next_alive := alive and next_health > 0.0
+	if is_equal_approx(next_health, get_health()) and bool(data["alive"]) == next_alive:
+		return
+	data["health"] = next_health
+	data["alive"] = next_alive
+	changed.emit(self)
+
+
 func tick_cooldown() -> void:
 	if get_attack_cooldown() > 0:
 		data["attack_cooldown"] = get_attack_cooldown() - 1
@@ -211,14 +223,14 @@ func take_damage(amount: float) -> float:
 	return previous - get_health()
 
 
-func mark_attacked() -> void:
-	data["attack_cooldown"] = _weapon_cooldown_ticks()
+func mark_attacked(tick_interval: float = 1.2) -> void:
+	data["attack_cooldown"] = _weapon_cooldown_ticks(tick_interval)
 
 
-func _weapon_cooldown_ticks() -> int:
+func _weapon_cooldown_ticks(tick_interval: float) -> int:
 	var weapon := SimulationItems.get_weapon(get_weapon_id())
 	var seconds := weapon.attack_cooldown if weapon != null else 0.6
-	return maxi(int(ceil(seconds / 1.2)), 1)
+	return maxi(int(ceil(seconds / maxf(tick_interval, 0.0001))), 1)
 
 
 func to_dictionary() -> Dictionary: