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* gh-149504: Fix re-entrancy bug when .pth/.start file invokes site.addsitedir() (#149659)
* Add re-entrant tests for gh-149504
* Add end-to-end integration test coverage
This ensures that future whitebox internal test changes do not regress the
public surface semantics.
* Implement a state class to process .pth and .start files
By using this state class and managing implicit and explicit batching, we make it structurally
impossible to get bitten by re-entrant site startup processing.
Fixes #149504
(cherry picked from commit b162307d7f)
* Add myself back to CODEOWNERS