setBuilderCode method
Set the account's sticky builder-code attribution to builderCodeId, an
existing BuilderCode object borrowed as &BuilderCode. Command order
is auth → set (auth is a hot potato consumed by this call). Lives in the
PREDICT package's predict_account module, NOT the account package.
Implementation
Transaction setBuilderCode(String owner, String builderCodeId) =>
_txOf(authed.setBuilderCode(
config: _c._config,
wrapper: _c.wrapperIdFor(owner),
code: builderCodeId,
));