[guillaume-michel]

Fixes #146

Problem

The operator- overloads in src/tamm/op_dag.hpp that build op trees had the same body as the matching operator+ overloads. The right-hand operand was never negated, so A - B built the same AddOp as A + B.

Change

Negate the right-hand operand in each of the three subtraction overloads:

• lhs - rhs -> {lhs, -1.0 * rhs}
• lhs - value -> {lhs, Scalar{-value}}
• value - rhs -> {Scalar{value}, -1.0 * rhs}

Testing

Not built or tested locally. This PR adds no regression test.

🤖 Generated with Claude Code

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