[metadata] fix: include setuptools in dev extra

[Wangmerlyn]

Summary

• Add the setuptools>=77,<82 requirement to the dev extra so the documented editable dev install includes the metadata parser used by package metadata tests.
• Add a package metadata regression test for the dev extra.
• Keep the local-dev dependency contract in AGENTS.md and docs/contributing.md aligned.

Test Plan

• RED: PYTHONPATH=src pytest tests/test_package_metadata.py::test_dev_extra_declares_metadata_test_parser_dependency -q failed before the metadata fix because setuptools>=77,<82 was missing from dev.
• GREEN: PYTHONPATH=src pytest tests/test_package_metadata.py::test_dev_extra_declares_metadata_test_parser_dependency -q
• PYTHONPATH=src pytest tests/test_package_metadata.py -q
• mkdocs build
• pre-commit run --all-files --show-diff-on-failure

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 63f3aef5-c198-4152-aa10-5abfb0ef1dab

📥 Commits

Reviewing files that changed from the base of the PR and between c887d05 and f62c0ff.

📒 Files selected for processing (4)

• AGENTS.md
• docs/contributing.md
• pyproject.toml
• tests/test_package_metadata.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/dev-extra-setuptools

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[gemini-code-assist]

Code Review

This pull request updates the documentation and configuration to explicitly include setuptools in the dev optional dependencies for local test imports, and adds a corresponding test. The reviewer recommends refactoring the new test to check for the presence of the setuptools dependency dynamically rather than asserting a hardcoded version string, which makes the test less fragile to future version bumps.

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