Adds everything needed to publish the extension to the VS Code Marketplace:
- README.md — full feature documentation with commands table, keyboard
shortcuts, configuration reference, quick start guide, and @gsd chat
participant usage
- CHANGELOG.md — initial 0.1.0 release notes
- .vscodeignore — excludes src/, tsconfig, maps from the .vsix package
- .gitignore — excludes dist/ and *.vsix from version control
- LICENSE — MIT license copied from repo root
- package.json — adds repository, homepage, bugs, keywords, galleryBanner
fields required by the marketplace; adds @vscode/vsce to devDependencies;
adds publish script
Verified: `npm run package` produces a clean 30KB .vsix with no warnings.
Run `npm run publish` with a VSCE_PAT token to publish.
