Remove missing coverage config reference from pytest defaults

[Ajeem-git]

Summary: Fix the default pytest configuration so contributors can run tests in a clean clone without a missing .coveragerc error.

What changed:

• Removed --cov-config=.coveragerc from tool.pytest.ini_options.addopts in pyproject.toml.

Why:
The repository does not include a .coveragerc file, but pytest was configured to require it by default. Coverage reporting is already configured in pyproject.toml, so the extra flag was unnecessary and caused default pytest invocations to fail.

Verification:

• Parsed pyproject.toml with Python tomllib after the change.
• Confirmed that pytest addopts no longer contains --cov-config=.coveragerc.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@af9b14f). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2243   +/-   ##
=======================================
  Coverage        ?   86.71%           
=======================================
  Files           ?      166           
  Lines           ?     9761           
  Branches        ?        0           
=======================================
  Hits            ?     8464           
  Misses          ?     1297           
  Partials        ?        0           

Flag	Coverage Δ
cpu	86.71% <ø> (?)
pytest	86.71% <ø> (?)

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