Add CI: ruff lint and pytest on Python 3.10-3.13

[solidspark]

Summary

Add a CI workflow. It runs on each pull request and on each push to main. Before this, the only workflow was the PyPI publish on v* tags.

What runs

• lint: ruff check . on Python 3.12.
• test: pytest -q on Python 3.10, 3.11, 3.12 and 3.13 (from requires-python = ">=3.10"), on ubuntu-latest. Install is pip install -e ".[dev]". The dev extra already has pytest, pytest-asyncio and ruff.
• pytest exit code 5 (no tests collected) counts as a pass. main has no tests yet. Every other non-zero code fails the job.
• permissions: contents: read, pip cache on, and concurrency cancels older runs on the same ref.

ruff format --check is not in the workflow. Six source files are not format-clean on main. Reformat them in a separate PR, then add the check.

No source changes. ruff check . already passes on main.

PR #1

When #1 merges, its tests/test_server_config.py runs in this job. Rebase #1 on this branch to get CI on #1 before it merges.

Testing

• Local venv: pip install -e ".[dev]", ruff check . passes, pytest -q exits 5 and the workflow step converts it to 0.
• actionlint v1.7.7: no findings.

Agent handoff

• Branch claude/ci-tests. One file: .github/workflows/ci.yml.
• Follow-ups: run ruff format . and add ruff format --check . to the lint job. When tests exist, remove the exit-code-5 rule. Make lint and test required checks in branch protection (repo admin).
• pyproject.toml classifiers list 3.10 to 3.12 only. The matrix also tests 3.13.

🤖 Generated with Claude Code