The i386 build ran on ubuntu-22.04, which is retired on April 17, 2027, and ubuntu-24.04 lacks fmod and exp10 in the static i386 libm. Build on ubuntu-26.04 for every architecture except MIPS, whose cross toolchains Ubuntu 26.04 no longer ships, and move the decnum, oniguruma and valgrind workflows too. Most release binaries are now built with GCC 15 and glibc 2.43, and they remain statically linked.