New github.rs module with three commands:
- github_list_repos: lists user's repos via GitHub API (paginated)
- github_create_repo: creates a new repo with auto_init
- clone_repo: git clone with HTTPS+token auth, configures remote
Also extends Settings with github_token field (Rust + TypeScript),
and adds GithubRepo type to shared types.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
6e4119c28b