Explain the Lean def `Jlog` in module `IndisputableMonolith.Cost`. Write for an educated reader who knows science and programming but may not know Lean. Cover: (1) what the declaration says in plain English, (2) why it matters in Recognition Science, (3) how to read the formal statement, (4) visible dependencies or certificates in the supplied source, and (5) what this declaration does not prove. Cite only declarations present in the supplied Recognition source.

The supplied canon source does not contain module IndisputableMonolith.Cost or any definition of Jlog. Jlog is referenced (but not declared) in theorems within IndisputableMonolith.Information.EMLFromRecognition, such as reciprocal_cost_forgets_orientation which uses Jlog and Jcost_symm. No declaration, dependencies, or certificates for Jlog exist in the provided modules. (1) The declaration cannot be described because it is absent. (2) Its role in Recognition Science cannot be explained from the canon. (3) The formal statement cannot be read because it is not present. (4) No visible dependencies or certificates appear in the source. (5) What it does not prove cannot be assessed. The question exceeds the supplied slice.