chore: add code review agent commands

[fdematos]

Summary

• move code review guidance into a dedicated agent definition
• add review command templates for working tree and branch diffs

Testing

• not run

[opencode-agent]

Now let me analyze the changes and provide a comprehensive review:

Code Review

Issues

No blocking issues found.

Simplification candidates

1. Goal: Improve consistency and reduce duplication between review-changes.md and review-pr.md
   Constraints: No behavior change, maintain current functionality
   Evidence: Both files use similar patterns for reviewing changes but duplicate the git command logic
   Location: command/review-changes.md and command/review-pr.md
   Suggested change: Consider creating a shared template or using the existing /diff-summary command more consistently

2. Goal: Clarify the relationship between the code-reviewer agent and the review commands
   Constraints: No behavior change, maintain documentation accuracy
   Evidence: The agent definition mentions "code review mode" but doesn't explicitly reference the new review commands
   Location: agent/code-reviewer.md:21
   Suggested change: Add a brief note in the agent documentation referencing the available review commands

3. Goal: Improve error handling in the review-pr.md command
   Constraints: No behavior change, maintain current functionality
   Evidence: The command assumes $1 and $2 parameters exist without validation
   Location: command/review-pr.md:6
   Suggested change: Add parameter validation or use default values similar to diff-summary.md

Overall Assessment

The changes represent a good refactoring that:

• Moves code review guidance from a skill to a dedicated agent definition
• Creates reusable command templates for common review scenarios
• Maintains the same core functionality while improving organization

The implementation follows good practices:

• Proper use of frontmatter metadata
• Clear separation of concerns between agent definition and commands
• Consistent use of existing tools like /diff-summary
• Appropriate permission restrictions for the code-reviewer agent

The changes are well-structured and maintain the original intent while providing better organization and reusability.

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