Worked on the simonmichael/stackage repository to enhance build system configuration by updating the build-constraints.yaml file. The primary focus was on including the Mantissa package under the appropriate contributor’s scope, which improved ownership traceability and streamlined onboarding for future contributors. This change aimed to increase build reproducibility and reduce the risk of misattribution in subsequent releases. The work involved careful editing and validation of YAML configuration files, ensuring that the build process accurately reflected contributor responsibilities. No bugs were addressed during this period, with efforts concentrated on refining the build system using skills in YAML and build system configuration.