Still TODO:

- We need to handle disembargos with target = (importedCap = ...).
- Testing.

The := below is sufficient, since this isn't actually used before that.

Also, along the way, use the snapshot from resultsCapTable
instead of calling .Snapshot() on the client.

Needs testing.

The test is currently failing; we're getting back an abort message
complaining that the export entry is not a promise -- need to
investigate.

Aside from that failure, this caught a bug: we need to check if
ClientState.Metadata is nil, which is possible if the client itself is
null, and seems to happen to the promise after it is resolved.

TODO: we should de-dup the logic between releaseExport and
releaseExports. This is not entirely trivial though, because the
latter is executed after we've wiped the exports table.

...also failing (hanging) for now.

...which we were forgetting to set. We can query snapshot for this
anyway, so just get rid of it -- single source of truth and all.

When looking at the target of the promise, we want to look at its
*resolution.*

Otherwise we get a runtime error sometimes.

...the latter often just results in me staring at cascading errors,
which is unhelpful.

Push the logic for flushing the answerqueue into the Promise type
itself. This is much cleaner, and avoids some racy logic that I'm not
sure was correct.