PR Description

Closes #157.

This PR restores the WIND/WAVES Fido client to fetch data from the updated SPDF directories specifically mentioned directories like rad1_idl_binary and rad2_idl_binary making Fido search and fetch work together with spectrogram.

What changed

• Updated radiospectra/net/sources/wind.py to use the new SPDF dailyfile URL patterns (year subdirectories) for RAD1/RAD2.
• Added _check_wavelengths logic to filter queries correctly for both receivers RAD1 and RAD2 based on frequency/wavelength overlap.
• Added tests in radiospectra/net/sources/tests/test_wind_client.py.
• Updates spectrogram_factory.py's _read_idl_sav method to correctly parse dates from prefixed filenames and added test.

AI Assistance Disclosure

AI tools were used for:

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding
• No AI tools were used

AI was used to draft an initial version of the client changes and some unit tests i reviewed and edited all output and verified behavior via tests.

Regardless of AI use, the human contributor remains fully responsible for correctness, design choices, licensing compatibility, and long-term maintainability.

@samaloney, Let me know your thoughts on this. Happy to make changes!