fix: keep node error-branch token semantics and add grep fallback

internal/js/chat-stream/sse_parse_impl.js

@@ -29,7 +29,7 @@ function parseChunkForContent(chunk, thinkingEnabled, currentType, stripReferenc
       finished: true,
       contentFilter: false,
       errorMessage: formatErrorMessage(chunk.error),
-      outputTokens,
+      outputTokens: 0,
       newType: currentType,
     };
   }

tests/scripts/run-unit-node.sh

@@ -17,6 +17,10 @@ trap cleanup EXIT
 if ! node --test --test-concurrency=1 tests/node/stream-tool-sieve.test.js tests/node/chat-stream.test.js tests/node/js_compat_test.js "$@" 2>&1 | tee "$NODE_TEST_LOG"; then
   echo
   echo "[run-unit-node] Node tests failed. 失败摘要如下："
-  rg -n "^(not ok|# fail)|ERR_TEST_FAILURE" "$NODE_TEST_LOG" || true
+  if command -v rg >/dev/null 2>&1; then
+    rg -n "^(not ok|# fail)|ERR_TEST_FAILURE" "$NODE_TEST_LOG" || true
+  else
+    grep -nE "^(not ok|# fail)|ERR_TEST_FAILURE" "$NODE_TEST_LOG" || true
+  fi
   exit 1
 fi