Update pytest config to native TOML format from v9

[browniebroke]

Description

This was picked up by Copilot during code review. Documentation: https://docs.pytest.org/en/stable/reference/customize.html#pyproject-toml

[Copilot]

🟢 Approval recommended

The change cleanly updates pytest configuration to the pytest v9 native TOML format without altering the effective test options.

Pull request overview

Updates the project’s pytest configuration in pyproject.toml to use pytest v9’s native TOML configuration table, enabling structured TOML types (notably using an array for addopts) while preserving the existing test options and paths.

Changes:

• Migrate pytest configuration table from [tool.pytest.ini_options] to [tool.pytest] (pytest v9 native TOML).
• Convert addopts from a single string into a TOML array of arguments.
• Keep existing testpaths, markers, and filterwarnings settings under the new table.

File summaries

File	Description
pyproject.toml	Moves pytest config to pytest v9 native TOML table and represents addopts as a TOML array.

Review details

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

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