Address remaining code review comments from PR #159

[Copilot]

Addresses the remaining code review feedback from PR #159 that wasn't covered by PRs #160-164. Fixes include removing unused parameters, improving test robustness, and adding data validation.

API cleanup

• Removed unused base parameter from plot_contour_map function signature and all call sites (utils.py, tests, notebook)
• Removed unused ResultsWrapper import from test file

Robustness improvements

• Added data trimming before reshape operations to handle non-divisible-by-10 data lengths:

  # Before: raises ValueError if len(data) not divisible by 10
  xpoints = np.mean(dta[xvar].values.reshape(-1, 10), axis=1)
  
  # After: trims to nearest multiple of 10
  n_trim = (len(dta[xvar].values) // 10) * 10
  xpoints = np.mean(dta[xvar].values[:n_trim].reshape(-1, 10), axis=1)

Test improvements

• Removed unreachable code in test_empty_data (lines within always-false conditional)
• Fixed test_logit_with_interaction to avoid mutating shared fixture data
• Replaced brittle assertions:
  • Removed assert np.all(np.abs(result.params) > 1e-5) (too strict for legitimate near-zero coefficients)
  • Replaced exact equality check with property-based validation (verify predictors present vs. hardcoded coefficient values)
  • Removed non-deterministic p-value significance assertion dependent on random data

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.20%. Comparing base (4071d0e) to head (a6c6aaf).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #165      +/-   ##
==========================================
+ Coverage   94.01%   94.20%   +0.19%     
==========================================
  Files          13       13              
  Lines         935      915      -20     
==========================================
- Hits          879      862      -17     
+ Misses         56       53       -3     

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