🤖 Add GitHub Copilot CLI support

[dsyme]

Overview

Adds support for the GitHub Copilot CLI as an agentic engine in the workflow system.

Key Changes

• Added Copilot CLI as a new engine option
• Updated validation and engine registry to include Copilot
• Implemented Copilot-specific log parsing and metrics extraction
• Extended command-line tools to recognize Copilot engine

Technical Details

• Added copilot to allowed engine types in schemas
• Created copilot_engine.go with engine implementation
• Updated CLI flags and help text to include Copilot option
• Implemented new log parsing script for Copilot CLI outputs

Testing

• Added unit tests for Copilot engine registration
• Verified engine validation works with Copilot option
• Ensured log parsing handles various Copilot output scenarios

Notes

Copilot support is currently marked as experimental.

[dsyme]

More work is needed but this is getting closer