Add GitHub Copilot CLI support to Developer Kit plugins

[giuseppe-ft]

Summary

Add GitHub Copilot CLI compatibility to enable installation of Developer Kit plugins via copilot plugin install.

Motivation

The Developer Kit currently supports Claude Code, OpenCode CLI, and Codex CLI. Adding GitHub Copilot CLI support would expand the user base and allow more developers to benefit from the skills, agents, and commands.

Current State vs GitHub Copilot CLI Requirements

According to GitHub Copilot CLI documentation, there are several differences in plugin structure:

1. Plugin Manifest

Aspect	Current	GitHub Copilot CLI
Location	.claude-plugin/plugin.json	plugin.json or .github/plugin/plugin.json
Format	JSON	JSON

2. Agents

Aspect	Current	GitHub Copilot CLI
File extension	.md	.agent.md
Example	java-refactor-expert.md	java-refactor-expert.agent.md

3. Skills

Aspect	Current	GitHub Copilot CLI
File name	SKILL.md	SKILL.md (compatible)
Structure	Directory with SKILL.md	Directory with SKILL.md (compatible)

4. Commands

Aspect	Current	GitHub Copilot CLI
Format	Single .md file	Directory with command.md
Example	devkit.verify-skill.md	devkit.verify-skill/command.md

Implementation Options

Option A: Dual-format support

Keep existing structure and add Copilot-specific files:

• Add plugin.json symlink/copy to each plugin root
• Add .agent.md copies of agent files
• Convert command .md files to directories with command.md

Option B: Build script

Create a build script that generates Copilot-compatible structure:

• scripts/generate-copilot-plugins.sh
• Generate all required files from source

Option C: GitHub integration

Use .github/plugin/plugin.json path which is supported by Copilot CLI

Affected Plugins

All 11 plugins would need updates:

• developer-kit-core
• developer-kit-java
• developer-kit-typescript
• developer-kit-python
• developer-kit-php
• developer-kit-aws
• developer-kit-ai
• developer-kit-devops
• developer-kit-project-management
• developer-kit-tools
• github-spec-kit

Verification

After implementation, verify with:

copilot plugin install owner/repo
copilot plugin list

References

• GitHub Copilot CLI Plugin Reference
• CLAUDE.md - Multi-CLI Support Matrix

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Priority: Medium
Complexity: Medium (requires structural changes across all plugins)
Breaking Change: No (additive enhancement)