Switch from docformatter to pydocstringformatter

[adamtheturtle]

Replace docformatter with pydocstringformatter for docstring formatting.

Changes

• Replace docformatter==1.7.7 with pydocstringformatter==0.7.3 in dev dependencies
• Update [tool.docformatter] to [tool.pydocstringformatter] in pyproject.toml
• Update pre-commit hook configuration

See: https://github.com/DanielNoord/pydocstringformatter

---

Note

Adopts pydocstringformatter for docstring formatting and updates project tooling accordingly.

• Replace docformatter with pydocstringformatter in dev dependencies and pre-commit hooks
• Add [tool.pydocstringformatter] config and remove [tool.docformatter]; tweak Ruff docstring ignores
• Reflow/shorten docstrings across src/, tests/, and docs/ to the new style; no runtime logic changes

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