Guide for adding a new reward function to AReaL. Use when user wants to create a reward function.
$npx -y skills add areal-project/areal --skill add-rewardInstalls into the current project.
Run `npx skills use "https://github.com/areal-project/areal" --skill "areal-project/areal/add-reward"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/areal-project/areal" that are relevant to the current task. Run `npx skills add "https://github.com/areal-project/areal"` and select the relevant skills, then follow their instructions.