Set up Copilot instructions

[Copilot]

Adds repository-specific instructions for GitHub Copilot coding agent per best practices.

Creates .github/copilot-instructions.md with:

• Project context - TOSCA-based deployment tool overview
• Code structure - Python (unfurl/), Rust (rust/), submodules (tosca-parser/)
• Build/test commands - tox, pytest, cargo test, mypy
• Key dependencies - Python 3.8+, Rust toolchain requirements
• Coding conventions - PEP 8, type hints, YAML handling patterns
• Environment setup - Required git config and env vars for tests

Original prompt

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This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title> <issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

<Onboard this repo></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes onecommons/unfurl#353

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Please retry analysis of this Pull-Request directly on SonarQube Cloud

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud