Family 125: browser intake for a separate conventional review module

The current dossier retains source threshold/recovery limits and the deferred approximation engine. A browser interface now checks weighted rectangular plans locally, without applying the narrow source theorem to those inputs. 119 controls and actual browser observations cover calculations and export content; native in-app saving remains unverified.

No new manuscript reading, proof acceptance, customer study or commercial validation was added. The browser is an interface to the first product experiment, not another independent business.