[agent:claude-cli] feat(boost): turbo boost avec énergie/cooldown, barre HUD dynamique, speed lines overlay et son distinct au déclenchement

scripts/dolphin/DolphinController.gd

@@ -19,6 +19,13 @@ signal echolocation_triggered(position: Vector3, radius: float)
 signal stats_changed(oxygen: float, health: float, hunger: float)
 signal player_died()
 signal use_consumable_requested()
+signal boost_changed(energy: float, max_energy: float, is_active: bool)
+
+# --- Boost parameters ---
+@export var boost_max_energy: float = 100.0
+@export var boost_drain_rate: float = 40.0   # energy/s while boosting
+@export var boost_regen_rate: float = 20.0   # energy/s when not boosting
+@export var boost_min_energy_to_start: float = 15.0  # minimum to engage boost
 
 # --- Internal State ---
 var oxygen: float
@@ -26,6 +33,7 @@ var health: float
 var hunger: float
 var is_boosting: bool = false
 var is_echolocating: bool = false
+var boost_energy: float = 100.0
 
 var _yaw: float = 0.0
 var _pitch: float = 0.0
@@ -47,6 +55,7 @@ func _ready() -> void:
 	oxygen = max_oxygen
 	health = max_health
 	hunger = max_hunger
+	boost_energy = boost_max_energy
 	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
 	_setup_input_actions()
 	_emit_stats()
@@ -125,7 +134,25 @@ func _physics_process(delta: float) -> void:
 
 
 func _update_movement(delta: float) -> void:
-	is_boosting = Input.is_action_pressed("boost")
+	var wants_boost: bool = Input.is_action_pressed("boost")
+	# Only boost if we have energy and enough to start
+	if wants_boost and boost_energy >= boost_min_energy_to_start:
+		is_boosting = true
+	elif wants_boost and is_boosting and boost_energy > 0.0:
+		is_boosting = true  # keep boosting until empty
+	else:
+		is_boosting = false
+
+	# Update boost energy
+	if is_boosting:
+		boost_energy = max(0.0, boost_energy - boost_drain_rate * delta)
+		if boost_energy <= 0.0:
+			is_boosting = false
+	else:
+		boost_energy = min(boost_max_energy, boost_energy + boost_regen_rate * delta)
+
+	boost_changed.emit(boost_energy, boost_max_energy, is_boosting)
+
 	var speed: float = swim_speed * (boost_multiplier if is_boosting else 1.0)
 
 	# forward/right using camera pitch for intuitive swim direction