ci (Windows): the runner's msys2 shell starts as the base MSYS environment (MSYSTEM=MSYS), which install-deps.sh rejects. Set the job-level MSYSTEM=UCRT64 env and prepend /ucrt64/bin to PATH in every Windows step, so pacman installs and the toolchain resolve against the mingw-w64-ucrt-x86_64 packages. fixtures: the restructured workspace moved the media fixtures into crates/oak-app/tests; the remaining references pointed at the old repo-root tests/ — oak-codec realmedia_tests + hwdecode, oak-node serializer golden, oak-worker procpool integration. All point at ../oak-app/tests now (oak-app's own tests/demo.mp4 references were already correct after the move).