Function melee_attack 

pub fn melee_attack(
    name: &str,
    agent_pos_key: &str,
    target_pos_key: &str,
    can_attack_key: &str,
    attack_request_key: &str,
    melee_range: f32,
) -> BehaviorNode

Action: perform a melee attack if the target is within melee_range.

Reads:

• "{agent_pos_key}" — Vec3
• "{target_pos_key}" — Vec3
• "{can_attack_key}" — bool

Writes:

• "{attack_request_key}" — bool true