Note

Improves Fork GC pipe read/write error handling and memory safety, and adds tests that simulate pipe failures during GC/apply.

• Core (src/fork_gc.c)
  • FGC_sendFixed: use fgc->ctx for logging and exit via RedisModule_ExitFromChild on broken pipe.
  • FGC_recvFixed: robust poll/read loop with explicit poll_rc handling and detailed diagnostics (errno, revents).
  • FGC_recvBuffer: refactor to use a temporary length and buffer; fix allocation/free paths to avoid double-free and correctly set out params.
  • Minor safety/cleanup: initialize fieldName to NULL; remove unused pre-fork PID.
• Tests (tests/cpptests/test_cpp_forkgc.cpp)
  • Add testPipeErrorDuringGC and testPipeErrorDuringApply to simulate pipe closures/errors and verify graceful handling without crashes or double-frees.

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