change coverage test to two tail p-value

[ConnorStoneAstro]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the coverage test to compute a two-tailed p-value rather than the previous one-tailed version.

• Introduces a two_tailed_p function in utils.py that performs density‐based two‐tailed p-value calculation.
• Updates pted_coverage_test in pted.py to use the new two_tailed_p function and adjusts behavior for the single-simulation case.
• Adjusts test expectations and documentation in tests.py and README.md to align with the new two-tailed strategy.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/pted/utils.py	Added two_tailed_p function for computing two-tailed p-values.
src/pted/pted.py	Updated p-value aggregation to use two_tailed_p for combined tests.
src/pted/tests.py	Modified test assertions to match new two-tailed p-value behavior.
README.md	Updated documentation to describe the two-tailed coverage test.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a92fa33) to head (ca943b9).

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #3   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          190       212   +22     
=========================================
+ Hits           190       212   +22     

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