Fix LP extraction for sliced matrix sums#132
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Summary
Fix LP extraction for
MatrixVariablerow and column slice sums so transport-style linear programs build correct constraint rows and solve successfully.What changed
VectorVariableinstances yield backing scalar variable names during LP coefficient extractionValidation
uv run pytest tests/test_solver_integration.py -k transport -quv run pytest tests/test_solver_integration.py -k 'transport or matrix' -quv run quarto render docs/