🐛 fix: use shasum on macOS, sha256sum on Linux

- Detect which hash command is available
- Fix script compatibility across platforms
- Maintain same functionality

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

scripts/test-local-ci-cd.sh

@@ -34,7 +34,12 @@ echo ""
 
 # 2. Calculate dependency hash (match CI workflow)
 echo "2. Calculating dependency hash..."
-export DEPS_HASH=$(sha256sum go.mod go.sum | sha256sum | cut -d' ' -f1 | head -c 12)
+# Use shasum on macOS, sha256sum on Linux
+if command -v sha256sum >/dev/null 2>&1; then
+    export DEPS_HASH=$(sha256sum go.mod go.sum | sha256sum | cut -d' ' -f1 | head -c 12)
+else
+    export DEPS_HASH=$(shasum -a 256 go.mod go.sum | shasum -a 256 | cut -d' ' -f1 | head -c 12)
+fi
 echo "Dependency hash: $DEPS_HASH"
 echo "✅ Dependency hash calculated"
 echo ""