Add missing PyPI environment for OIDC

[RareBird15]

Summary

This change adds a missing environment configuration for the PyPI publishing job in the workflow.

What Changed

• Introduced the environment: pypi line in the publish-pypi job.

Why

• The addition resolves the absence of a specified environment for the PyPI publishing process, ensuring proper execution.

Validation

• uvx ruff check .
• uv run python -m unittest discover tests -v
• I tested the affected workflow manually, if applicable

Accessibility Review

• I considered how this change sounds in a screen reader, not just how it looks in a terminal
• I did not add decorative ASCII, visual-only cues, or formatting that makes output harder to read aloud
• Prompts, labels, and headings remain plain, predictable, and understandable

Content and Policy Review

• I did not commit copyrighted EPUBs or generated plan content without explicit rights
• I updated documentation if user-visible behavior changed
• I updated CHANGELOG.md if this change is user-visible

Notes for Reviewers

• Review the environment configuration to ensure it aligns with the intended deployment process.

[Copilot]

Pull request overview

Adds the missing GitHub Actions job environment configuration required for PyPI “trusted publishing” via OIDC, so the release workflow’s PyPI publish step can execute with the expected environment context.

Changes:

• Set environment: pypi on the publish-pypi job in the release workflow.

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