refactor: replace black, isort and pylint with ruff

[hf-krechan]

Summary

• Merges the linting dependency group down to ruff==0.16.0 only (drops pylint); drops the now-empty formatting group (was black/isort).
• Translates [tool.black]/[tool.isort]/[tool.pylint."MESSAGES CONTROL"] into [tool.ruff]/[tool.ruff.lint] (line-length 120, select = ["E", "W", "F", "I", "UP", "B", "N", "PL", "RUF"], standard PLR0913/PLR0917/PLR0912/PLR0915/PLR2004 ignores, extend-exclude = ["*.md"] so ruff format doesn't touch fenced code blocks in docs).
• Deletes unittests/.pylintrc - none of its disables (too-few-public-methods, redefined-outer-name, duplicate-code) have a ruff equivalent to translate to, and we're not selecting pydocstyle (D) rules either.
• .pre-commit-config.yaml: replaces psf/black + pycqa/isort with astral-sh/ruff-pre-commit (tag verified to exist), ruff-check scoped to src/mypackage+unittests (pylint's old scope), ruff-format unscoped (black/isort's old scope).
• CI: pythonlint.yml's linting matrix entry now runs ruff check src/mypackage unittests. formatting.yml keeps its tool: [black, isort] matrix values (both are required status checks, confirmed via branch protection) but each now runs a real ruff command via matrix.include, with an explicit job name: "format (${{ matrix.tool }})" so the reported check names stay byte-identical.
• README updated (title, badge label, tooling bullet list, dropped the pylint-specific VS Code setting).

Test plan

• ruff check src/mypackage unittests (pylint's old scope) - clean
• ruff format --check . (black/isort's old scope) - clean, confirmed *.md is excluded via --verbose
• uv.lock diff reviewed - only the pylint/black/isort transitive dep tree removed and ruff added, no unrelated version bumps
• CI (pytest/mypy/coverage/packaging) - not run locally on this resource-constrained machine, relying on GitHub's runners

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[Copilot]

🟡 Not ready to approve

Ruff configuration and workflow naming/documentation have a few correctness/clarity issues that should be addressed before merging.

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Pull request overview

Refactors the repository’s Python linting/formatting toolchain to consolidate on Ruff, updating dependency groups, pre-commit hooks, CI workflows, and documentation accordingly.

Changes:

• Replaces black/isort/pylint with ruff in pyproject.toml dependency groups and tooling configuration.
• Updates pre-commit hooks and GitHub Actions workflows to run ruff check / ruff format while preserving existing required status check names.
• Removes legacy pylint configuration and updates README references/instructions to match the new tooling.

File summaries

File	Description
uv.lock	Removes black/isort/pylint dependency tree and adds ruff.
unittests/.pylintrc	Deletes pylint-specific configuration no longer used.
README.md	Updates documentation and badges to reference Ruff instead of black/isort/pylint.
pyproject.toml	Replaces black/isort/pylint tool configuration with Ruff configuration and updates dependency groups.
.pre-commit-config.yaml	Switches pre-commit formatting/lint hooks to astral-sh/ruff-pre-commit.
.github/workflows/pythonlint.yml	Replaces pylint invocation with ruff check in the linting job matrix.
.github/workflows/formatting.yml	Keeps legacy check names but routes formatting/import-order checks through Ruff.

Review details

• Files reviewed: 6/7 changed files
• Comments generated: 4
• Review effort level: Low

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[hf-krechan]

Good catch, fixed in e08c2c0: renamed the job id from pylint to lint. Confirmed this is safe for branch protection — the required status check name comes from the job's explicit name: Python Code Quality and Lint field (plus the matrix suffix), not the YAML job id, so this doesn't touch the required-checks list.

[hf-krechan]

Correct, but this is a pre-existing typo unrelated to the black/isort/pylint→ruff swap (that line never mentioned any of the removed tools). Per this migration's scope, I'm leaving it as a separate cosmetic follow-up rather than fixing it inline here.

[hf-krechan]

Same as the Github/GitHub comment above: this is a pre-existing typo unrelated to the tool swap this PR is about, so I'm leaving it out of scope rather than fixing it inline here.

[hf-krechan]

Checked with uv run ruff check --show-settings src/mypackage/mymodule.py: ruff already resolves linter.unresolved_target_version = 3.11 / formatter.unresolved_target_version = 3.11 on its own, inferred from requires-python = ">=3.11" in [project]. So an explicit target-version in [tool.ruff] would be redundant, not a fix for a gap — same as how isort's line-length is inferred without extra config. Leaving it as-is.