Pull request overview

Adds in-script documentation clarifying an unintuitive git checkout master -- || git checkout -b master edge case when multiple remotes provide a master branch, so future contributors understand why master’s reflog may end up reflecting HEAD history during test initialization (Closes #2145).

Changes:

• Document how git checkout master -- can fail due to ambiguous remote-tracking branches when master is missing locally and multiple remotes have it.
• Explain that the script then creates master at the current HEAD, affecting which history the reflog-reset sequence records (before resetting back to __testing_point__).

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Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

I didn't think of a better way to deal with this besides adding a comment. Also, I had originally thought of including this as part of some larger PR, but it doesn't really fit nicely in with any of the other forthcoming GitPython PRs I'm working on. So I'm doing it by itself. I think this at least better than not expanding the comment, and I plan to merge this once CI passes.