Change default alphag for number counts to 0

[marcpaterno]

Description

This PR changes the default value of alphag for the number counts linear bias from 1 to 0.
This is desired because the growth factor is already included in the power spectrum.
A alphag value of 0 thus does not additional correction.

Fixes #507

Type of change

Please delete the bullet items below that do not apply to this pull request.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

The following checklist will make sure that you are following the code style and
guidelines of the project as described in the
contributing page.

• I have run bash pre-commit-check and fixed any issues
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have 100% test coverage for my changes (please check this after the CI system has verified the coverage)

[Copilot]

Pull Request Overview

This PR fixes an issue in the number counts likelihood by correcting the default value of the growth function exponent (alphag) from 1.0 to 0.0 so that the additional growth correction is removed. The change helps ensure that the growth factor is not applied twice when computing the bias.

Comments suppressed due to low confidence (1)

firecrown/likelihood/number_counts.py:84

• The default value of 'alphag' has been updated to 0.0, which is in line with the intended correction. Verify that tests and any related documentation are updated accordingly to reflect this change.

LINEAR_BIAS_DEFAULT_ALPHAG = 0.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (7c980b5) to head (6e4d12d).
⚠️ Report is 17 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #514   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files          50       50           
  Lines        4775     4775           
  Branches      532      532           
=======================================
  Hits         4775     4775           

Files with missing lines	Coverage Δ
firecrown/likelihood/number_counts.py	100.0% <100.0%> (ø)

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