Playwright stops a webServer with a SIGKILL to the process group it
spawned, but `nx run-commands` starts its command in a detached process
group of its own. Launching the Xtream/Stalker mocks through
`pnpm nx run *-mock-server:serve` therefore left the tsx server running
(reparented to PID 1) and holding its port after every run, so the next
run failed with "…/health is already used" or silently reused a stale
server.
Every Playwright config now starts the mocks as a single
`node --import tsx apps/<mock>/src/main.ts` process with
TSX_TSCONFIG_PATH=tsconfig.base.json, which stays in Playwright's group.
A project-config spec guards all playwright*.config.ts files against
regressing to the Nx launch.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>