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test(transport): scaffold MemoryStream test homes (PR 2a/5) (#474)

* test(transport): scaffold MemoryStream test homes (PR 2a/5)

Land the file layout for eliminate-mock-gateway PR 2 in a separate,
mechanical PR ahead of the routing-test content (PR 2b/2c). Doing the
scaffolds first stabilizes import paths so PR 4 port targets cannot
shift under us.

- src/transport/sync/memory.rs: sync MemoryStream + Condvar-based
  read_message; mirror of the async fixture from PR 1, frame-level
  since Io::read_message returns unframed bodies.
- src/connection/sync_tests.rs: scaffold + Send+Sync assertion proving
  Connection<MemoryStream> compiles.
- src/connection/async_tests.rs: scaffold; AsyncConnection is concrete
  on tokio TcpStream halves, so real tests wait on a generalize-or-
  inject refactor (PR 4).
- src/transport/async_tests.rs: scaffold; routing tests land in PR 2c
  once AsyncTcpMessageBus can be built over a memory-backed connection.
- Move async_memory wiring from transport/mod.rs to transport/async.rs
  per the plan Files-to-modify section.

* test(transport): drop unproductive 20ms sleep in MemoryStream test

Either thread ordering produces a passing test; the sleep added latency
without exercising the wait path.

* test(transport): use From<PoisonError> for Error, standardize destructure

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