Loc.Current (src/ClaudeDo.Ui/Localization/Loc.cs) is a process-wide mutable
static; which localizer is active depended on xUnit's parallel test
scheduling. Ui.Tests: disable collection parallelization (cheap, pure VM
suite) and install the real localizer in a module initializer so no test
can ever observe the uninitialized key-echo default. Worker.Tests: install
the same module initializer but leave parallelization on — disabling it
measured a 27% wall-clock regression on its real-SQLite/git suite, and the
initializer alone already removes the race. AgentConfigEditorViewModelTests
now installs its own localizer instead of relying on ambient state.
Mika Kuns
dc1e67d07b