Janus hardens the substrate: storage replay, atomics, and build cache
Janus shipped another trench wave: byte-keyed storage moved into replay and recovery work, atomics gained real lowering and smoke coverage, build caching became operational infrastructure, and several compiler truth-preservation bugs were closed under storage pressure.
januscompilerstoragelsmatomicsbuild-systemstdlibsovereign-systemsfield-report