docs: add Windows contributor setup guide

[yejiming]

What was wrong?

docs/README-windows.md only contained placeholder TODO items, so Windows contributors did not have a usable setup guide.

How was it fixed?

• documented a native Windows workflow using conda
• documented a WSL-based workflow for contributors who want a Linux-like setup
• added a newsfragment for the documentation update

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Document shell requirement for pre-commit on native Windows

The native Windows workflow asks contributors to run pre-commit install from Anaconda Prompt or PowerShell, but this repository includes a local pre-commit hook that runs sh -c ... (.pre-commit-config.yaml), which fails when sh is not available on PATH (a common default in these shells). In that setup, contributors who follow this guide will hit hook execution failures on commit, so the instructions should call out a Git Bash/WSL requirement or provide a PowerShell-compatible alternative.

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