Every operation we work with has the same structural fragility: a rule that decides money — a deduction, a discount schedule, a dispatch convention — exists only in one person’s judgement. It works, right up until that person is on holiday, retires, or simply gets it wrong on a Tuesday.
The fix is not to write the rule into application code, which just moves the fragility to a release cycle. The fix is to make the rule catalogue data: declared, versioned, effective-dated, and reviewable by the person who actually knows whether it is right.
That is the whole thesis. Everything else on this site — the constraint solver, the offline journal, the edge deployment — is engineering in service of it.