fix(fuzz): disable stack probes in static libproven.a for Rust linking

Author: hyperpolymath

.clusterfuzzlite/build.sh

@@ -25,7 +25,7 @@ mkdir -p "$OUT"
 if [[ -f ffi/zig/build.zig ]]; then
   pushd ffi/zig >/dev/null
   mkdir -p zig-out/lib
-  zig build-lib -static -O ReleaseSafe -fPIC --name proven \
+  zig build-lib -static -O ReleaseSafe -fno-stack-check -fPIC --name proven \
     -femit-bin=zig-out/lib/libproven.a src/main.zig -lc || {
     echo "WARN: standalone Zig FFI build failed; fuzz targets will not link." >&2
     exit 1