Pathway Model Sanity Check Agent

Adding one reaction to a metabolic model can let it create mass or energy from nothing, and nobody notices until a result looks too good. This agent runs after every model change. It performs mass balance and charge checks, tests for energy-generating cycles, and confirms the model still grows or produces what it should on known conditions. It finds the reactions that break the checks, ranks likely causes such as a wrong stoichiometry or a reversibility flag, and proposes a fix for each. It reruns the checks after each fix until they pass or the limit is reached. You approve the new model version. Edge case: reactions that are intentionally unbalanced, like exchange reactions, are on an allowed list.