Fixes merging, improves f corona modeling

[jmbhughes]

No description provided.

[jmbhughes]

pre-commit.ci autofix

[codecov]

Codecov Report

Attention: Patch coverage is 16.50485% with 86 lines in your changes missing coverage. Please review.

Project coverage is 86.17%. Comparing base (872f76b) to head (690eac8).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
punchbowl/level3/f_corona_model.py	7.24%	64 Missing ⚠️
punchbowl/level2/merge.py	35.71%	9 Missing ⚠️
punchbowl/level3/stellar.py	11.11%	8 Missing ⚠️
punchbowl/level1/flow.py	25.00%	3 Missing ⚠️
punchbowl/level2/flow.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #333      +/-   ##
==========================================
- Coverage   87.03%   86.17%   -0.87%     
==========================================
  Files          56       56              
  Lines        3734     3791      +57     
==========================================
+ Hits         3250     3267      +17     
- Misses        484      524      +40     

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