* Sync library behavior with CPython 3.15.0
Import exact d220409a13b77de7a6c30abe16ea90db01528edc sources through scripts/update_lib migrate, preserving the existing logging test marker. Retain focused Python license and mock property regressions outside Lib. This later Python-stage change requires native binascii wrapcol support; listener DNS runtime validation remains out of scope.
Assisted-by: OpenAI Codex:model identifier unavailable
* Keep the library update limited to upstream files
Remove the two PR-added extra_tests snippets as requested in review. Preserve the script-migrated CPython library files and their canonical tests unchanged.
Assisted-by: OpenAI Codex:model identifier unavailable
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