[pitboss] phase 16: Track B — Rust + C + C++ harness emitter shapes

tests/dynamic_fixtures/cpp/libfuzzer/benign.cpp

@@ -0,0 +1,14 @@
+// Phase 16 — libFuzzer entry, benign.
+
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+    (void)data; (void)size;
+    std::printf("__NYX_SINK_HIT__\n");
+    std::fflush(stdout);
+    std::system("echo hello");
+    return 0;
+}