Reheating with lnR_rad

[lukashergt]

I was encouraged to investigate lnR_rad as an alternative reheating parameter. From a prior weight perspective, I am fairly sure that this will be equivalent to N_star.

Checklist:

• I have performed a self-review of my own code.
• My code is PEP8 compliant (flake8 --max-line-length 99 primpy tests).
• My code contains compliant docstrings (pydocstyle --convention=numpy primpy).
• New and existing unit tests pass locally with my changes (python -m pytest).
• I have added tests that prove my fix is effective or that my feature works.
• I have appropriately incremented the semantic version number in both README.rst and anesthetic/__version__.py.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.06%. Comparing base (723f7c7) to head (b89e04e).

Additional details and impacted files

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##           master      #69      +/-   ##
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+ Coverage   99.05%   99.06%   +0.01%     
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  Files          18       19       +1     
  Lines        2325     2356      +31     
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+ Hits         2303     2334      +31     
  Misses         22       22              

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[Copilot]

Pull Request Overview

This PR introduces lnR_rad as an alternative reheating parameter that is agnostic to the details of reheating. The implementation adds support for this parameter in the calibration methods and includes comprehensive test coverage for various parameter combinations.

• Adds lnR_rad parameter support to calibration methods as a reheating-agnostic alternative
• Creates new helper functions for instant reheating validation
• Extends test coverage to validate parameter consistency across different calibration approaches

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
primpy/reheating.py	New module containing instant reheating validation logic
primpy/inflation.py	Integrates lnR_rad parameter into calibration methods with validation
tests/test_inflation.py	Comprehensive test coverage for new parameter combinations and validation scenarios
cobaya_wrapper/slowroll_pps.py	Minor adjustments to phi_i calculation and comoving Hubble horizon output
primpy/version.py	Version bump to 2.17.0
README.rst	Version update in documentation