feat: add double-barrel shotgun weapon, player movement state machine, and procedural sound assets

movement/states/state_ground.gd

@@ -5,6 +5,7 @@ var machine: MovementStateMachine
 var params: MovementParams:
 	get: return machine.params
 
+var _footstep_timer: float = 0.0
 
 func enter(_data: Dictionary = {}) -> void:
 	machine.on_ground = true
@@ -33,6 +34,8 @@ func update(delta: float) -> void:
 		machine.on_ground = false
 		machine.coyote_timer = 0.0
 		machine.register_chain_mechanic("jump")
+		if player.jump_player:
+			player.jump_player.play()
 		machine.switch_to("air")
 		return
 
@@ -43,6 +46,8 @@ func update(delta: float) -> void:
 		machine.on_ground = false
 		machine.jump_buffer_time = 0.0
 		machine.register_chain_mechanic("jump")
+		if player.jump_player:
+			player.jump_player.play()
 		machine.switch_to("air")
 		return
 
@@ -86,6 +91,16 @@ func update(delta: float) -> void:
 
 	_update_capsule_height()
 
+	var current_hspeed = Vector2(player.velocity.x, player.velocity.z).length()
+	if current_hspeed > 1.0:
+		_footstep_timer -= delta
+		if _footstep_timer <= 0.0:
+			if player.footstep_player:
+				player.footstep_player.play()
+			_footstep_timer = max(0.2, 3.0 / current_hspeed)
+	else:
+		_footstep_timer = 0.0
+
 	# ── Update ground status ──────────────────────────────────────────────
 	if player.is_on_floor():
 		machine.on_ground = true