chore: configure codecov checks as informational

[vdusek]

Summary

• Add patch coverage target at 50%
• Set both project and patch status checks to informational mode so they report coverage but never block CI

Test plan

• Verify codecov.yaml syntax is valid
• Merge and verify Codecov status checks appear as informational on next PR

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.88%. Comparing base (69b8af9) to head (764b15b).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #821      +/-   ##
==========================================
- Coverage   85.92%   85.88%   -0.04%     
==========================================
  Files          46       46              
  Lines        2778     2778              
==========================================
- Hits         2387     2386       -1     
- Misses        391      392       +1     

Flag	Coverage Δ
e2e	37.07% <ø> (ø)
integration	58.60% <ø> (-0.04%)	⬇️
unit	73.43% <ø> (ø)

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