[turinglambdaai]

Summary

• retrieve each generated promise future exactly once and reuse it for waiting and reading
• fulfill successful Void RPC promises instead of timing out
• update checked-in Windows/Linux host clients and add generator regressions

Validation

aco test rivet/tests/codegen.rkt (160 passed)

• native CMake build + CTest on Windows (10/10 passed)
• full
  aco test rivet/tests reached 10002/10003; the only failure is the Linux native installer test requiring a Linux executable unavailable on Windows