Fix/pylint python39 compatibility

[BrandtKruger]

Explain your changes

This commit adds conditional pylint installation using PEP 508 environment
markers in the [project.optional-dependencies] section:

• Python 3.10+: pylint >=4.0.0 (latest version)
• Python 3.9: pylint >=2.0, <4.0 (compatible version)

Changes:

• Add 'dev' optional dependency group with conditional pylint installation
• Remove hardcoded pylint = "^4.0.0" from [tool.poetry.dev-dependencies]
• Add documentation comments explaining the conditional installation

This maintains full backwards compatibility with Python 3.9 while allowing
Python 3.10+ users to benefit from pylint v4 features.

Fixes Python 3.9 CI/CD compatibility issue with pylint v4 upgrade.

Checklist

• I have read the “Pull requests” section in the contributing guidelines.
• I agree to the terms within the code of conduct.

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Walkthrough

The README.md file was updated with a Development Setup section documenting the editable installation process with development dependencies, including specific tool requirements and conditional pylint version specifications based on Python version compatibility.

Changes

Cohort / File(s)	Summary
Development Documentation README.md	Added Development Setup section with installation instructions (pip install -e ".[dev]"), development tool list (pytest, mypy, pylint, etc.), and conditional pylint version constraints by Python version (3.10+: >=4.0.0; 3.9: >=2.0, <4.0). Content duplicated in two locations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Duplication concern: The Development Setup section appears twice in the README—verify intentionality and consistency between both instances
• Version constraint accuracy: Confirm that the conditional pylint version specifications (Python 3.10+ → >=4.0.0; Python 3.9 → >=2.0, <4.0) align with project requirements and are correctly reflected in any pyproject.toml or setup.py configuration files

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: fixing pylint compatibility for Python 3.9 by implementing conditional dependency installation based on Python version.
Description check	✅ Passed	The description clearly explains the changes made, including conditional pylint installation, removal of hardcoded dependencies, and documentation additions, which align with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[dtoxvanilla1991]

Looks good to me, with the following thought:

• since users now must use pip install -e ".[dev], should this be more visibly and clearly documented elsewhere other than .toml file comment?

[BrandtKruger]

Looks good to me, with the following thought:

• since users now must use pip install -e ".[dev], should this be more visibly and clearly documented elsewhere other than .toml file comment?

I added some details in the ReadMe document.