Add a "Before proposing a new skill" subsection to CONTRIBUTING.md that
defines a checklist contributors run before opening a new-skill PR: search
the existing catalog, check open PRs for overlapping proposals, confirm the
idea fits the skill anatomy, and justify in the PR description why it isn't
already covered.
The goal is to set clear rules/guidelines that curb duplication, since the
open-PR backlog has accumulated clusters of near-duplicate skill proposals.
Reorganize the section into "Before proposing a new skill" and "Creating the
skill" so the decision step comes before the how-to.
Add MIT LICENSE file, CONTRIBUTING.md with skill quality guidelines,
expand .gitignore for safety, and remove leftover idea-refine.zip artifact.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>