Skill Builder — Create, heal, and audit skill packages

skill-builder owns the full structural lifecycle of one skills/<slug>/ source package: create it, verify its structure, repair owned projections, and audit its content discipline. It does not schedule work, allocate writers, operate Git, validate a software candidate, promote learnings, or decide what happens after a failure.

Before creating a new root, search skills/*/SKILL.md for an existing owner. Extend an existing skill when it already owns the requested behavior.

Modes