Inspired by Claude Code's /simplify. A bundled skill that captures recent
changes via git diff, fans out three focused reviewers (reuse, quality,
efficiency) via delegate_task batch mode, then aggregates findings and
applies the fixes worth applying.
Zero core changes — orchestrates existing tools (terminal/git, search_files,
delegate_task). Supports focus, dry-run, and scoped-diff modifiers.
Closes#379.
