release: bump version to 0.3.1

[vchomakov]

Summary

Bump version to 0.3.1 to resolve PyPI version conflict.

Changes

• Update version in pyproject.toml from 0.3.0 to 0.3.1
• Update version in src/version.py from 0.3.0 to 0.3.1
• Regenerate lock file (uv.lock) to reflect new version
• Disabled UV cache to prevent pipeline stalling due to lock issues

Reason

There was a version conflict on the PyPI repository that prevented publishing. This version bump resolves the conflict and allows for a clean release.

Testing

• All lint checks pass (ruff check, ruff format)
• Security scan passes (bandit)
• All tests pass (273/273) with 88% coverage
• Package builds successfully (uv build)
• Package validation passes (twine check)

Release Plan

After the merge, this will be tagged as 0.3.1 and released to PyPI.