Fix tox configuration and add pyproject.toml

[traylenator]

• Add pyproject.toml with setuptools build system configuration
• Replace deprecated py.test invocation with pytest
• Remove redundant 'pip install -e .' from tox commands, as tox handles package installation itself

Summary by CodeRabbit

• Chores
  • Updated build system configuration to use setuptools.
  • Updated test environment to run tests via pytest.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: dac5ba05-d0ad-4ed8-8cb9-127e7bb3c497

📥 Commits

Reviewing files that changed from the base of the PR and between 1d980c9 and 0885f47.

📒 Files selected for processing (2)

• pyproject.toml
• tox.ini

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📝 Walkthrough

Walkthrough

This PR modernizes the Python project's build and test infrastructure by introducing a pyproject.toml file with setuptools build-system configuration and simplifying the tox test command from a multi-step sequence to a direct pytest invocation.

Changes

Build and Test Configuration Modernization

Layer / File(s)	Summary
Build System Configuration pyproject.toml	New [build-system] section declares setuptools as build requirement and setuptools.build_meta as build backend.
Test Command Simplification tox.ini	Test environment commands updated from pip install -e . and py.test -s to single pytest invocation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 The build tools hop with joy today,
setuptools shows the modern way.
No more complex command dance—
pytest runs with just a glance! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: adding pyproject.toml and fixing tox configuration by replacing deprecated py.test with pytest.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jaysonsantos]

Thank you @traylenator