Add directional, MPI, restart, and kernel regression tests#1213

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sbryngelson wants to merge 12 commits intoMFlowCode:masterfrom

sbryngelson:better-tests

Commits on Feb 28, 2026

Add direction symmetry, MPI consistency, restart roundtrip, and kernel tests

sbryngelson
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claude
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Fix 3 issues from AI review: timeout after restart, stale case.py, float consistency

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claude
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Fix pylint warnings introduced by restart_check addition

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Fix mid_step ignoring t_step_start in restart roundtrip

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Fix restart roundtrip, grid stretching, and hypoelasticity test failures

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Fix Phase 1 t_step_save to use interval relative to t_step_start

sbryngelson
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Fix 3 issues from AI review: timeout after restart, stale case.py, float consistency

sbryngelson
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claude
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Warn instead of silently swallowing directory restore failures

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Guard run_restart against degenerate t_step_stop ≈ t_step_start

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Fix inconsistent t_step_start access in run_restart Phase 1

sbryngelson
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Skip restart roundtrip check during --generate mode

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Add documentation comment to run_restart() about t_step_save constraint

sbryngelson
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claude
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