reviewer

I want to set up the "reviewer" agent in my project.

Please run this command in my terminal:
# Copy to your project's .claude/agents/ directory
mkdir -p .claude/agents && curl --retry 3 --retry-delay 2 --retry-all-errors -o .claude/agents/reviewer.md "https://raw.githubusercontent.com/Windy3f3f3f3f/claude-code-from-scratch/main/.claude/agents/reviewer.md"

Then explain what the agent does and how to invoke it.