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* Support frozen ElementTree attribute mappings Preserve assigned mapping identity while copying constructor attributes, and use checked union ownership through Element operations. Assisted-by: OpenAI Codex:gpt-6.1-sol * Sync final ElementTree runtime and companion tests Import ElementTree.py from CPython d220409a13b77de7a6c30abe16ea90db01528edc through update_lib migrate. Copy six complete canonical tests with update_lib copy-test, preserving all surrounding test markers. This aligns pure-Python and native frozendict diagnostic expectations and covers the runtime import companion changes. Assisted-by: OpenAI Codex:model version unavailable