Restore WAVES client and update source

[samaloney]

Describe the feature

WIND/WAVES data is now served from SPDF and has equivalent IDL sav files with slightly different naming conventions.

https://spdf.gsfc.nasa.gov/pub/data/wind/waves/ specifically

• https://spdf.gsfc.nasa.gov/pub/data/wind/waves/rad1_idl_binary/
• https://spdf.gsfc.nasa.gov/pub/data/wind/waves/rad2_idl_binary/

Proposed solution

Restore the removed client and update for this URL pattern and update spectrogram for different naming scheme radiospectra/spectrogram/spectrogram_factory.py:L660

start_time = Time.strptime(file.stem.split("_")[-1], "%Y%m%d")

[Amityush-lgtm]

@samaloney, I’ve addressed the filename/date parsing update in PR #151 spectrogram_factory.py for WIND/WAVES prefixed names as you asked in #58.
If you want, I can work on the remaining scope in this issue like restoring the WAVES net client and updating the SPDF source URL pattern.

[Omiii-215]

@Amityush-lgtm
I can take this on.

Plan:

1. Restore the WAVES Fido client using the SPDF rad1_idl_binary / rad2_idl_binary URL patterns (daily files, year subdirectories).
2. Update WAVES spectrogram filename parsing so the date is extracted from the final underscore chunk (e.g., wind_waves_rad1_19941110 → 19941110) as noted in the issue.
3. Add focused tests: (a) filename→date parsing for both RAD1/RAD2, (b) scraper URL generation for a known day.

Once that’s in, Fido.search/fetch + Spectrogram should work end-to-end against SPDF.

If @samaloney agrees I'll start with the work.

[Amityush-lgtm]

@Omiii-215
Thank you for telling your plan and i’m sorry for any confusion. When your message came, I had already started working on this issue with filename-date parsing implemented in #151 and i am working on SPDF WAVES client and URL pattern updates. I didn’t mean to overstep, I just began work earlier based on the guidance in #58.
I planned to open a PR once @samaloney gives me a green signal. If you’d like to help with tests or edge cases, I’d be very grateful and happy to coordinate.