sktime-mcp: GitHub Actions CI

Added the first CI pipeline to sktime-mcp, the MCP server for the sktime time-series library, with linting and tests across Python 3.9 to 3.12.

sktime-mcp exposes the sktime time-series library through the Model Context Protocol. It had no CI, so I added a GitHub Actions workflow that runs on every push and PR:

  • a lint job running ruff and black --check with the project's existing config,
  • a test job running pytest on Python 3.9, 3.10, 3.11 and 3.12, with fail-fast off so every version reports.

It added no new dependencies, since the tools were already in the project's dev extras.

Links: PR #20 • Issue #19