Unity C# Gameplay Script Helper

Write Unity C# code for the following gameplay feature.

Engine: Unity 6 / URP
Feature: [DESCRIBE MECHANIC]
Input: [KEYBOARD / GAMEPAD]
Requirements:
- Use [CharacterController / Rigidbody2D / custom]
- Include [SerializeField] for designer tuning
- No external packages unless specified
- Add brief XML summary comments

Output: single script file with clear class name and setup notes.