Move -Werror to pyproject.toml

[nlebovits]

Related Issue(s):

• Add -Werror to pyproject.toml #837

Description:
Moves -Werror from scripts/test to pyproject.toml for consistent warning handling across all test runs. Removes redundant decorators.

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to CHANGELOG.md

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.06%. Comparing base (21435b0) to head (19ccb0c).
⚠️ Report is 154 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #841      +/-   ##
==========================================
+ Coverage   93.43%   95.06%   +1.63%     
==========================================
  Files          13       15       +2     
  Lines         990     1217     +227     
==========================================
+ Hits          925     1157     +232     
+ Misses         65       60       -5     

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