Specifically, make this on the Rust side bridge layer, and tack it on
to the end of per-member endorsements for the app side to peel off
later, rather than the app layer calling back down to Rust to compute
it. This saves a fair amount of marshalling work.
Each of these updates is required for the following update, and the
final one allows us to use 'record'.
The target SDK version is set to 33, matching the Android app.
