fix

Reviews any Claude Code artifact (SKILL.md, agent .md, hooks.json, plugin.json, marketplace.json, CLAUDE.md), then automatically generates an improved version targeting the highest-impact issues. Shows a before/after diff and asks for confirmation before writing. Follows the additive-only principle: never removes existing content. Auto-detects the file type from the path. Use when the user asks to "fix", "improve", "auto-fix", "enhance", "optimise", "rewrite", or "make better" any Claude Code file — or when a review score is below 80 and the user wants changes applied automatically.