Sebastien Dasys enhanced the Houjio/HarmoniQ repository by focusing on developer onboarding and foundational energy feature development. He refactored the installation process to use package-based installation with development dependencies, updated the README, and added detailed contribution documentation, all written in Markdown and reStructuredText. Sebastien also scaffolded new energy source modules in Python, implementing initial hydro energy production calculations and establishing utility functions and basic tests. His work emphasized maintainability and future extensibility, laying a solid groundwork for accelerated feature delivery. The depth of his contributions improved project accessibility and set up a robust structure for ongoing module development and testing.