Fixed C++ build failures in `miner/core/tests/CMakeLists.txt`:
- Applied `-mavx2 -mvaes` compilation flags to `CryptoNight_x86_vaes.cpp` in the test library target, mirroring the main build configuration. This resolves the `target specific option mismatch` error during compilation.
- Applied optimization flags to `CnHash.cpp` in the test library target.
Verified Go implementation:
- Confirmed `PingPeer` is implemented in `pkg/node/controller.go`.
- Confirmed `handlePing` is implemented in `pkg/node/worker.go`.
- Confirmed `go.mod` includes necessary dependencies.
Recorded learnings regarding CMake property propagation across directories.
Fixed multiple issues causing CI failures:
- Fixed C++ build on Linux by excluding macOS-specific source files in miner/core/tests/CMakeLists.txt.
- Fixed Go test panic in pkg/mining/manager_test.go by properly checking for nil return from StartMiner.
- Fixed runtime panic in pkg/mining/service.go where generateRequestID was attempting to base64 decode a timestamp string; replaced with crypto/rand.
- Verified removal of unused fmt import in pkg/ueps/packet.go.
