Skill Improve

Runs an improvement loop on a single skill: test → fix → retest → keep or revert.

Phase 1: Parse Argument

Read the skill name from the first argument. If missing, output usage and stop:

Usage: /skill-improve [skill-name]
Example: /skill-improve tech-debt

Verify .claude/skills/[name]/SKILL.md exists. If not, stop with: "Skill '[name]' not found."