fix: use valid PEP 440 syntax for requires-python

[kkikendall]

Summary

The release pipeline has been silently broken since the Poetry [tool.poetry] -> PEP 621 [project] migration: requires-python = "^3.9.2" uses Poetry's caret syntax, which is valid under the old [tool.poetry] table but is not valid PEP 440, which is what PyPI's upload validator requires for the PEP 621 requires-python field.

The last two release attempts both succeeded at bumping the version, tagging, and creating a GitHub Release, but the final poetry publish step failed:

HTTP Error 400: '^3.9.2' is invalid for 'requires-python'.

As a result, PyPI is currently stuck on 6.9.0 even though the repo/tags say 6.9.1.

Changes

• pyproject.toml: requires-python = "^3.9.2" -> requires-python = ">=3.9.2,<4.0.0" (equivalent constraint, valid PEP 440 syntax).
• poetry.lock: regenerated (poetry lock) to match — only the python-versions/content-hash metadata lines changed.

Test plan

• poetry build succeeds
• python -m twine check dist/* — PASSED on both sdist and wheel (previously this metadata shape is what PyPI itself rejects)
• Confirmed generated PKG-INFO now has Requires-Python: >=3.9.2,<4.0.0
• poetry run poe lint — all checks pass (isort, black, flake8, mypy)
• poetry run poe test — 15 passed, 1 skipped, 2 pre-existing failures unrelated to this change (they depend on a local httpbin-style server on localhost:8080 not present in this environment; confirmed they fail identically on unmodified main)

Once merged, the next conventional-commit release to main should finally reach PyPI (superseding the never-published 6.9.1).

🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

The constraint and lock metadata updates are consistent and address the publishing issue.

Pull request overview

Fixes the package’s Python version constraint so release metadata is valid for PyPI publishing.

Changes:

• Replaces Poetry caret syntax with >=3.9.2,<4.0.0 in pyproject.toml.
• Regenerates matching lock metadata in poetry.lock.

File summaries

File	Description
pyproject.toml	Defines the corrected Python version constraint.
poetry.lock	Synchronizes lock metadata with the updated constraint.

Review details

• Files reviewed: 1/2 changed files
• Comments generated: 0
• Review effort level: Lite

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