resubmitting #870

[henrydingliu]

Summary of Changes

adding earned premium data for friedland auto bi dataset
adding earned premium to new _manifest.py source of truth
original work by @kennethshsu; resubmitting due to premature merging of new sample_data loading pattern by @henrydingliu

Related GitHub Issue(s)

#869

Additional Context for Reviewers

follows newly established pattern for adding new columns

• I passed tests remotely for both code (uv run pytest) and documentation changes (uv run jb build docs --builder=custom --custom-builder=doctest)

---

Note

Low Risk
Bundled sample CSV and manifest metadata only; no runtime logic, auth, or API behavior changes.

Overview
Adds Earned Premium as a third measure on the bundled friedland_auto_bi_insurer sample so load_sample exposes it alongside paid and reported claims.

The CSV gains an Earned Premium column with accident-year-level amounts (e.g. 24M for 2000, 18M for 2001), repeated on each calendar-year row for that accident year. _manifest.py registers the new column in columns, matching the manifest-driven sample loading pattern used elsewhere in the library.

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[henrydingliu]

@kennethshsu once again, my apologies. please review at your convenience

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.90%. Comparing base (8a9a46e) to head (1984eff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #892   +/-   ##
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  Coverage   86.90%   86.90%           
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  Files          87       87           
  Lines        4932     4932           
  Branches      624      624           
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  Hits         4286     4286           
  Misses        456      456           
  Partials      190      190           

Flag	Coverage Δ
unittests	86.90% <ø> (ø)

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