Add scheduled stress test workflow

[caspervonb]

No description provided.

[Copilot]

Pull Request Overview

This pull request adds stress testing capabilities to the project by introducing the pytest-repeat plugin and a new GitHub Actions workflow for automated stress testing.

Key Changes:

• Added pytest-repeat>=0.9.0 as a development dependency to enable test repetition
• Created a new .github/workflows/stress.yml workflow for scheduled and manual stress testing
• Configured the workflow to run tests 100 times by default with parallelization support

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
pyproject.toml	Added pytest-repeat to dev dependencies for test repetition functionality
uv.lock	Lock file updated with pytest-repeat 0.9.4 package metadata and dependencies
.github/workflows/stress.yml	New workflow for running stress tests with configurable repeat count and parallel workers, supporting multiple Python versions and operating systems

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[Copilot]

The stress test job lacks a timeout setting. Running 100 test iterations (the default count) could potentially take a very long time, especially on slower runners. Consider adding a timeout-minutes setting to the job to prevent it from running indefinitely if tests hang or take unexpectedly long. For reference, the regular test workflow uses timeout-minutes: 20.

Suggested change

	runs-on: ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	timeout-minutes: 20