ADC-686: prove all five nonzero Balance terms over MPI - #628
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Scope
Strengthen the installed two-rank Balance scenario so all five signed terms are real, nonzero
Program.sumreductions:q-qqq-2qThe test requires exact zero residual, equality between independent due consumers, and bit-identical accepted-diagnostic registries across ranks.
This is explicitly an authored accounting proof. It does not claim automatic extraction of AMR reflux/projection data.
History and validation
One separate thematic test commit, no squash/amend/rebase/force-push. Source checks are green (
py_compile, Ruff, diff hygiene). The real installed-packagempiexec -n 2run remains required before merge, so this PR is draft.