testing

Run, place and fix tests in this repo. Use when choosing which npm command runs a given suite (web unit, web integration, Storybook, cli, tui, launcher, scripts); when deciding where a new test file belongs — beside its source, under src/test/, or in a client's tests/; when a per-file coverage check fails or a v8 ignore is in question; when asking which test tier spawns the built binary rather than importing it; or…