feat(types): add py.typed marker for PEP 561 compliance
Add py.typed file to mark package as typed for mypy compatibility. This allows mypy to recognize pytfm as a properly typed package. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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