Add Hardy to sources

[zmoon]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.54%. Comparing base (352aa5c) to head (186bded).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   94.40%   94.54%   +0.14%     
==========================================
  Files          15       16       +1     
  Lines        1786     1833      +47     
==========================================
+ Hits         1686     1733      +47     
  Misses        100      100              

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[Copilot]

Pull request overview

Adds a new pyabc2.sources.hardy source module for loading Paul Hardy tunebooks, with accompanying tests and documentation updates to surface the new source in the public docs/examples.

Changes:

• Introduce pyabc2.sources.hardy with download + cached load_meta() for Hardy tunebooks.
• Add test coverage for Hardy source loading and key validation.
• Update documentation (API reference, changelog, and examples notebook) to include Hardy.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_sources.py	Adds tests for hardy.load_meta() behavior, bad-key handling, and a URL currency check for the annex tunebook.
pyabc2/sources/hardy.py	New source module implementing download + cached loading and tune-block splitting with optional prefix stripping.
docs/examples/sources.ipynb	Demonstrates using the new Hardy source in the examples notebook.
docs/changes.md	Notes the new Hardy source in the changelog.
docs/api.rst	Adds Hardy module/functions to the generated API docs.

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