The supplied Lean source slice does not contain the module IndisputableMonolith.Cost.Ndim.Uniqueness or the theorem forced_of_factorization.
While the Recognition Science framework establishes the uniqueness of the reciprocal-symmetric cost function (as THEOREM t5_holds / washburn_uniqueness_aczel from the broader canon, detailed in the primer), the specific mathematical and formal details of the multidimensional factorization theorem you asked about are absent from this slice. Therefore, I cannot give a step-by-step breakdown of its formal statement, dependencies, or limitations based solely on the provided source code.