Single RemoteError with a merge-extensible, domain-prefixed code map;
owners throw at the failure point; streams surface marked failures;
clients consume ctx.remote directly with isRemoteFailure as the only
discrimination point and construct no failure instances.
The goal domain has been served by GoalService's @Remote namespace since it
shipped; the API Proxy copy was a second implementation of the same six
mutations. Remove the goals contract, schemas, route rows, IApiClient stub,
host implementation, and the fixture's compatibility face, leaving
ctx.remote.goals as the only path.
The fixture's goal fold keeps its coverage through the Goal Remotes: its
lifecycle case moves out of the unary-dispatch test, which no longer has
goal rows to cover.
imccyu