[mylee04]

Summary

Validate stats_dump_interval as a multiple of 30 seconds below 60 minutes before passing it to the native client. This raises ValueError for values such as 3600 and 31 seconds instead of triggering a C++ assertion that terminates the Python process.

Update the documented range to [0s, 60min) and add regression coverage for rejected values and the largest valid value, 3570 seconds.

Closes: #108

Testing

• tests/unit/test_session.py: 80 passed on Python 3.12/macOS arm64 using the source Python package with the published 1.2.2 native extension.
• Both Session and Session.with_options reject invalid values before native construction; None and valid values (including 0 and 3570 seconds) are forwarded unchanged to the native constructor.
• All 80 session unit tests also passed on Ubuntu 24.04/Linux arm64 with a locally rebuilt native extension. Native mock controls through both public APIs confirmed the default, 30 seconds, and 3570 seconds.
• The invalid-value regression cases fail against the unmodified Python source.
• Black and Flake8 passed for the changed Python files; strict mypy passed for all 15 Python source files.

[pniedzielski]

(I've resolved a merge conflict brought about by merging #111; it was just documentation.)