test: remove coverage thresholds so coverage stays informational

[knowledgecode]

Summary

• test: drop coverage.thresholds from vitest.config.ts (previously 100% lines/statements/functions, 95% branches).

Coverage is still collected and uploaded to Codecov by the coverage job; it's just informational now.

Test plan

• npm run test:coverage completes successfully (exit 0) regardless of coverage percentage
• npm run lint
• npm run ts

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (f864518) to head (ae6e8cd).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #138   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files          77       77           
  Lines        1233     1233           
  Branches      357      357           
=======================================
  Hits         1218     1218           
  Partials       15       15           

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