Split packages/dashboard/app/__tests__/api.test.ts (~6.4k lines) into per-area files (auth, git, missions, projects, settings, tasks), and src/__tests__/routes.test.ts (~20k lines) into per-area files (agents, auth, automation, git, github, planning, settings, system, tasks, tasks-ops). The monolith files were dominating wall-clock for the dashboard suite under file-parallel execution.
Also document in packages/core/vitest.config.ts why the core suite cannot move to "threads": vitest-setup gates per-worker cwd on isMainThread (false in worker_threads, so isolation breaks), and setup-test-isolation writes process.env.HOME unconditionally (threads share env, so concurrent workers race).
Drop an unused execFileSync import from scripts/test-with-lock.mjs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
