Gareth Chay contributed to the nus-cs2103-AY2425S1/pe-dev-response repository by establishing the foundation for an asset library, focusing on frontend readiness and UI fidelity. During this period, Gareth added an initial image asset to support visual elements in the user interface, improving repository hygiene and asset management practices. The work did not involve changes to application logic but laid the groundwork for future UI enhancements and faster frontend iteration. Gareth utilized Git for version control and asset management, working within a JavaScript-based frontend environment. The contribution was foundational, providing necessary infrastructure for subsequent development rather than delivering feature depth.