Review PRs for Best Practices

Scan recent open PRs in the configured PR repository for violations of documented best practices.

• Interactive mode (default): drafts comments and asks for user approval before posting.
• Auto mode (auto argument): posts all violations automatically without approval. Designed for cron/headless use.
• full: review every file in each PR. Without it, a PR the bot reviewed before is reviewed only in the files whose changes differ since then, and a PR where none differ (a rebase, a merge of the base branch) is not reviewed again.

IMPORTANT: This skill only reviews PRs against existing best practices. It must NEVER create, modify, or add new best practice rules or documentation during a review run.