docs: add MIT LICENSE and drop WIP framing

[dantraynor]

Summary

• Adds a proper MIT LICENSE file, matching what the README already claimed
• Removes "wip" from the README description and package.json description — this plugin is shipped and working

Deferred

The issue also suggested a TypeScript compile check in CI. The existing build.yml already runs pnpm run build via esbuild, which transpiles TS (catching syntax errors). A stricter tsc --noEmit typecheck is blocked by upstream type errors inside the luna dependency itself ,follow-up once that's resolved upstream.

Closes #10

[Copilot]

Pull request overview

Updates repository metadata/documentation to reflect the project’s current status and licensing, aligning the repo with what the README already states.

Changes:

• Add an MIT LICENSE file.
• Remove “wip” wording from the README tagline.
• Update package.json description to remove “wip” and better describe the project.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Updates package description to remove “wip” framing.
README.md	Updates top-level description to remove “wip” framing.
LICENSE	Adds standard MIT License text and copyright notice.

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