Add tester for h5py interop via uv

[vrv-bit]

Adds a tester to run UV script to verify h5py can read the HDF files.

[kolkov]

Thank you for putting this together, and especially for reporting #28 and #29 — your bug reports led to finding and fixing 3 real interoperability bugs, all shipped in v0.13.11.

That said, we're going to close this PR. Our testing strategy validates interoperability exclusively against the official HDF5 C tools (h5dump, h5ls, h5debug) from the HDF Group. h5py, while popular, is itself a third-party implementation wrapping the C library — so testing against it would be testing against someone else's interpretation of the format rather than the authoritative reference. Going forward, the official C toolchain is our single source of truth for format compliance.

We've added Go-native regression tests in v0.13.11 that cover this exact scenario (group + attribute + multiple datasets in non-alphabetical order) with round-trip verification.

Contributions are always welcome — feel free to open issues or PRs anytime!