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ptest 1063 (constrained free-slip np2): iso golden value mismatch is environment-dependent and PRE-existing #495

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@lmoresi

Found during the #493 adversarial review: tests/parallel/test_1063_constrained_freeslip_parallel.py fails at np=2 on this macOS/arm64 environment on BOTH pre-#493 development and the #493 branch, with byte-identical iso L2 values across the two builds (0.5982807168536982 vs golden 0.6194547793955; the TI case differs between builds only at 6e-13, i.e. #493 is exonerated). The golden value appears environment- or partition-sensitive rather than wrong-code. Needs: re-derive the golden on CI vs locally, decide whether the assertion should be a cross-build invariant instead of an absolute golden.

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