Python Development

Apply the active project's Python version, dependency owner, public contracts,
and canonical commands.

Read the single owner procedure (skill file) for implementation,
debugging, testing, packaging, and native-gate evidence.

Use the distinct python-parallelization skill for async, thread, process,
vectorization, or throughput changes. Do not impose a tool, framework, or style
threshold that the project has not selected. Runtime behavior and project-owned
configuration are authoritative; generated files remain outputs.