- Add root vitest.config.ts with projects array (replaces deprecated workspace)
- Add name property to each project's vitest.config.ts for filtering
- Update package.json test scripts to use vitest projects
- Add vitest to root devDependencies
This addresses the Vitest warning about multiple configs impacting
performance by running all projects in a single Vitest process.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
