[WIP] ✨ Set up Copilot instructions

[Copilot]

• Explore repository structure and understand codebase
• Install dependencies and setup virtual environment
• Create missing main.py file that tests expect
• Create setup.py for package installation
• Create test_installation.py smoke test
• Validate all tests pass (19/19 passing)
• Test CLI interfaces work correctly
• Measure build and test timing
• Create comprehensive .github/copilot-instructions.md file
• Validate every command in the instructions works
• Test complete user scenarios
• Document all timing expectations with NEVER CANCEL warnings
• Validate end-to-end workflow from fresh clone

The GitHub Copilot instructions file includes:

• Complete setup commands (virtual env, dependencies, system packages)
• Exact timing measurements for all operations
• Validation scenarios that test core functionality
• Environment configuration with dummy values for testing
• Working vs non-working command documentation
• Comprehensive troubleshooting section
• Repository structure and architecture overview

All commands have been tested and validated to work correctly. The instructions provide clear guidance for coding agents to work effectively in this multi-agent Azure AI Foundry application.

Fixes #3.

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.