Pass kwargs to detector_frame_to_source_frame in CosmoModel.prob

[Copilot]

The CosmoModel.prob method was not forwarding kwargs to detector_frame_to_source_frame, breaking parametrized cosmologies (FlatwCDM, FlatLambdaCDM) that require cosmological parameters.

Changes

• Fixed kwargs forwarding: Added **kwargs to detector_frame_to_source_frame call in CosmoModel.prob (line 161)
• Added CosmoModel test coverage: 10 tests covering initialization, prob method with fixed/parametrized cosmologies, jacobian corrections, and parameter sensitivity

Example

from gwpopulation.experimental.cosmo_models import CosmoModel

model = CosmoModel(model_functions=[...], cosmo_model="FlatwCDM")
data = {"luminosity_distance": [1000.0], "mass_1_detector": [30.0]}

# Now works - cosmological parameters are properly forwarded
prob = model.prob(data, H0=70.0, Om0=0.3, w0=-1.0)

Original prompt

On cosmo_models.py, kwargs should be passed to detector_frame_to_source_mass. Also, add tests covering the CosmoModel.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.40%. Comparing base (fc60cf9) to head (72865e5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
+ Coverage   90.74%   91.40%   +0.66%     
==========================================
  Files          14       14              
  Lines         907      907              
==========================================
+ Hits          823      829       +6     
+ Misses         84       78       -6     

Flag	Coverage Δ
python3.10	91.40% <100.00%> (+0.66%)	⬆️
python3.11	91.40% <100.00%> (+0.66%)	⬆️
python3.12	91.40% <100.00%> (+0.66%)	⬆️
python3.13	91.40% <100.00%> (+0.66%)	⬆️

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