* feat: add GitHub Copilot slash command support
Add GitHub Copilot as a natively supported AI tool with custom slash
commands for OpenSpec workflow operations. This enables teams using
GitHub Copilot to access /openspec-proposal, /openspec-apply, and
/openspec-archive directly from Copilot's chat interface.
Implementation:
- Create GitHubCopilotSlashCommandConfigurator that writes prompts to
.github/prompts/ directory with YAML frontmatter and $ARGUMENTS
placeholder following GitHub Copilot's prompt format
- Register GitHub Copilot in AI_TOOLS configuration and slash
command registry for automatic init/update integration
- Add comprehensive test coverage for prompt generation, updates,
and extend mode detection
- Update documentation (README and CHANGELOG) to include GitHub
Copilot in the slash-command support table
The implementation follows the existing SlashCommandConfigurator
pattern and integrates seamlessly with openspec init and openspec
update commands.
* docs: remove GitHub Copilot from tools list
Tabish Bidiwale