build(deps-dev): support pytest 9

[Deathcharge]

What changed: widen the development pytest constraint from >=8,<9 to >=8,<10, superseding conflicted Dependabot PR #4 from current main. Why: pytest 9 is now permitted by project dependency policy, while #4 cannot merge after newer dependency updates landed. Impact: development and CI resolution only; runtime dependencies and behavior are unchanged. Validation: git diff --check passed and the exact one-file/one-line diff was reviewed against main 676dd8d. Hosted CI runs Python 3.11/3.13 on Ubuntu/Windows with Ruff lint/format, strict mypy, pytest coverage, distribution build, wheel-content inspection, and installed-wheel smoke tests. Local Python launch was blocked by the managed sandbox, so this draft remains unmerged pending hosted CI and independent review.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: edf4047e-3afa-4204-9779-483180466b6b

📥 Commits

Reviewing files that changed from the base of the PR and between 676dd8d and e8b883f.

📒 Files selected for processing (1)

• pyproject.toml

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Summary by CodeRabbit

• Chores
  • Updated development tooling compatibility to support pytest versions below 10.

Walkthrough

The development pytest constraint changed from >=8,<9 to >=8,<10 in pyproject.toml.

Changes

Pytest Constraint

Layer / File(s)	Summary
Widen pytest development range pyproject.toml	The development dependency now permits pytest versions >=8,<10 instead of >=8,<9.

Estimated code review effort: 1 (Trivial) | ~2 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/dependency-maintenance-20260813

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