tests: repair the two seams the ida-nexus port left behind

Two scenario monkeypatch sites still hooked client.invoke -- the rename to
call() updated the call sites but not the patches, so reprime_is_free and
split_view crashed instead of counting. call() takes the remote_ops
declaration itself now, so both count by its __name__.

remote_ops imported RemoteModule inside _bindings(), which made
test_nexus_client (NEEDS_IDA = False) unrunnable under a stdlib-only
python3 -- the house rule tests/run.py --fast depends on. The import moves
to the same eagerly-if-present, bound-to-None-so-patchable contract
nexus_client uses, and the test injects FakeRemoteModule/FakeRemoteError
exactly like its other fakes: real names when the library is installed,
strict fakes when it is not.

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