Ayush enhanced developer-facing diagnostics in the swiftlang/swift repository by refining error reporting and validation for Swift property wrappers, addressing issues with enclosing-self, key-path types, subscript parameters, and parameter naming. He introduced a dedicated diagnostic for invalid enclosing-self subscripts and improved synthesis behavior to prevent key-path inference failures, using C++ and Swift for compiler development and diagnostics. Additionally, Ayush expanded test coverage and updated regression expectations to ensure reliability. In malariagen/malariagen-data-python, he fixed a bug in CNV frequencies test interpolation, improving the evaluation of the cnv_type variable through targeted Python code changes and robust error handling.