Setup GitHub Copilot Repository Instructions

[mfittko]

Summary

This PR sets up GitHub Copilot coding agent support for the repository by adding comprehensive repository instructions.

Changes

• **Added ** with detailed project guidance
• Provides project overview and Phase 1 development context
• Documents architecture, directory structure, and core components
• Includes TypeScript coding standards and security requirements
• Lists key libraries (OpenAI SDK, Commander.js, Zod, MCP)
• Defines development patterns and testing strategy
• Outlines build/validation commands and IDE integration notes

Benefits

• Enables GitHub Copilot coding agent with repository-specific context
• Improves code suggestions aligned with project standards
• Helps maintain consistency across development phases
• Provides clear guidance for security-first development approach

Testing

• ✅ Instructions file created and validated
• ✅ Follows GitHub Copilot best practices for repository instructions
• ✅ Comprehensive coverage of project context and requirements

This setup will help GitHub Copilot provide more accurate and contextually relevant code suggestions for the Agents CLI project.

[Copilot]

Pull Request Overview

This PR adds GitHub Copilot repository instructions to provide context-aware code suggestions for the Agents CLI project. The instructions document establishes coding standards, architecture guidelines, and development patterns to help Copilot generate more relevant and consistent code suggestions aligned with the project's TypeScript-based multi-agent workflow engine.

Key changes:

• Added comprehensive repository instructions for GitHub Copilot integration
• Documented project architecture, coding standards, and security requirements
• Established development patterns and testing strategies for Phase 1 development

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_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}