Add DEMO.md explaining prototype execution and results

Implement working CloudCostCalaCLI prototype

Simplify metric model: normalize all consumption to instance-hours

Add billing file processing for real-life consumption analysis

Make synthetic unit conversion config-driven

Update instructions for cloud asset discovery and synthetic unit conversion

Rewrite copilot instructions for Go implementation

Refine copilot instructions based on development plans

Add copilot-instructions.md for development guidance

Initial commit