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Fixes #26027. Map the single-order compare-exchange failure ordering from `release` to `relaxed` and from `acquire-release` to `acquire`. Apply the mapping to the trivial and non-trivial strong and weak overloads, and correct the explicit-order test cases. Tested `tests/stdlib/concurrency/tatomics.nim` across C/C++, refc/orc, and native/C++ atomics (8 combinations). Also verified the original GCC 16.1 assertion reproducer.