VR now stays off at runtime in every build until --vr or vr.enabled: true,
so a normal launch on a VR-capable build never tries to reach an OpenXR
runtime and no longer exits when none is running.
MOCKTAIL_ENABLE_VR defaults to AUTO: OpenXR support is built when the
third_party/OpenXR-SDK submodule is present and skipped with a notice
otherwise, so source packages that do not fetch submodules (Nix, AUR) keep
building. ON still requires the submodule. mocktail-vr-probe is only built
and installed in VR builds.
CI gains an x86_64 job that builds and tests with MOCKTAIL_ENABLE_VR=OFF.
The config docs and README describe the new defaults.
dim-ghub
3ef81c3d93