New package: DocumenterCopyButton v0.1.0

[JuliaRegistrator]

• Registering package: DocumenterCopyButton
• Repository: https://github.com/harmoniqs/DocumenterCopyButton.jl
• Created by: @jack-champagne
• Version: v0.1.0
• Commit: 3c30a8fc0c1b3a3c74365e22922a99b7bee17361
• Reviewed by: @jack-champagne
• Reference: harmoniqs/DocumenterCopyButton.jl@3c30a8f#commitcomment-180169880
• Description: Documenter.jl plugin that adds floating Copy as markdown and Open in AI buttons to documentation pages
• Release notes:

## Changes

- Initial release of DocumenterCopyButton.jl
- Documenter.jl plugin that adds floating "Copy as markdown" and "Open in AI" buttons to opted-in documentation pages
- Pages opt in via `@meta CopyButton = true`
- Supports both pretty and flat URL modes
- Vanilla JS/CSS implementation with clipboard copy and AI provider dropdown

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[goerz]

[noblock] Looks neat, but some small feedback: Just "Copy" on the button might be a little confusing as to what is copied. I might recommend labeling that as "Copy MD" – or, potentially, just having the "AI" button, and include "Copy Markdown" as the bottom element of the menu that that button pops up. It would save some screen real estate

[jack-champagne]

[noblock] Down, I'll add this in