Validation testing refactor

[semohr]

This pull request makes validation tests backend-agnostic and introduces a shared set of reusable schemas and fixtures to unify testing across validation backends.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (4decca0) to head (247bc39).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
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+ Coverage   95.83%   95.85%   +0.01%     
==========================================
  Files          16       17       +1     
  Lines         985      988       +3     
==========================================
+ Hits          944      947       +3     
  Misses         41       41              

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[Copilot]

Pull request overview

Refactors the validation test suite to be backend-agnostic by introducing shared schemas/fixtures and moving validation tests into a dedicated tests/validation/ package, while cleaning up the previous backend-specific test file.

Changes:

• Added shared validator fixtures + reusable schema/fixture definitions for validation backend testing.
• Added a unified validation test suite that runs against all configured backends.
• Removed the previous tests/test_validate.py backend-specific test module and updated the changelog.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Updates locked dependency versions.
tests/validation/test_validate.py	Adds backend-agnostic tests for to_json_schema() and validate().
tests/validation/conftest.py	Introduces shared schemas and parametrized fixtures for backend testing.
tests/validation/init.py	Marks tests.validation as a package.
tests/test_validate.py	Removes old backend-specific tests.
src/eyconf/validation/backends/init.py	Adds a public re-export surface for validator backends.
CHANGELOG.md	Documents the upcoming test refactor.

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