September 2025 monthly summary for emscripten-core/emscripten. Focused on strengthening build reliability and correctness for modern C++ workflows. Key feature/bug fix: inline initialization of a static const char buffer within the affected class to ensure correct initialization at compile time, resolving ODR-related compilation errors in C++20 module builds. This change addresses a potential ODR violation and stabilizes the build process (commit 9946451f6c1b58651b0c48db6b83ab2b5c4b0317, related to #25368). Major bugs fixed: ODR-related compile failures in C++20 module scenarios; corrected static data initialization semantics. Overall impact: reduced build failures and smoother downstream adoption for projects targeting modern C++ with Emscripten, leading to faster iteration and higher reliability. Technologies/skills demonstrated: C++, inline initialization, ODR concepts, static data member management, C++20 modules, build-system troubleshooting and regression prevention.