v0.2.3-alpha

Fix Windows CI: /bigobj for the real MSVC C1128 section-limit error

Windows (x64) build failure, confirmed from the actual CI log
(run 32841214687): MSVC error C1128 compiling test_main.cpp --
"number of sections exceeded object file format limit" -- the
standard COFF ceiling a single, deliberately-unsplit ~14000-check
translation unit runs into on MSVC specifically (no equivalent limit
on GCC/Clang, which is why the Linux job never hit this). This is
what left kronos-windows-x64.zip missing from the v0.2.2-alpha
release: build-windows failed at the Build step, before Package/
Upload ever ran, while build-linux succeeded independently and
uploaded its own archive.

Fix: /bigobj on the engine_tests target for MSVC, the compiler's own
documented fix for this exact error.