mono - fix: upgrade vitest cluster to 4.1.5

[jaredwray]

Summary

• Upgrade vitest, @vitest/coverage-v8, and @vitest/spy from 4.1.3 to 4.1.5 in the workspace root.

Test plan

• pnpm install succeeds
• pnpm build succeeds
• pnpm test passes for all packages

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (46c31cc) to head (e20da78).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1621   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         2496      2496           
  Branches       555       555           
=========================================
  Hits          2496      2496           

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[gemini-code-assist]

Code Review

This pull request updates the vitest testing framework and its associated packages, including coverage-v8 and spy, from version 4.1.3 to 4.1.5 in both package.json and the pnpm-lock.yaml file. I have no feedback to provide.