fix: distinguish source preparation from retry failures

web/hwlab-cloud-web/src/components/agent/TraceTimeline.test.ts

@@ -179,6 +179,58 @@ describe("TraceTimeline sequence authority", () => {
     wrapper.unmount();
   });
 
+  it("does not classify normal Git source preparation as an infrastructure failure", async () => {
+    const wrapper = mount(TraceTimeline, {
+      props: {
+        autoExpanded: true,
+        trace: {
+          traceId: "trc_git_fetch_timeline",
+          eventSource: "hwlab-kafka-sse",
+          status: "completed",
+          eventCount: 2,
+          events: [{
+            sourceEventId: "evt_git_fetch_started",
+            runId: "run_git_fetch",
+            sourceSeq: 5,
+            source: "agentrun.kafka",
+            type: "backend",
+            status: "running",
+            label: "agentrun:backend:runner-source-fetch-started",
+            failureDomain: "infrastructure",
+            failureComponent: "git-mirror",
+            failureCode: "git-mirror-fetch-in-progress",
+            summary: "正在从 Git mirror 获取 Runner 源码",
+            retryPhase: "initialAttempt",
+            retryAttempt: 1,
+            retryMaxAttempts: 3,
+            createdAt: "2026-07-20T10:00:01.000Z"
+          }, {
+            sourceEventId: "evt_git_fetch_completed",
+            runId: "run_git_fetch",
+            sourceSeq: 6,
+            source: "agentrun.kafka",
+            type: "backend",
+            status: "running",
+            label: "agentrun:backend:runner-source-fetch-completed",
+            failureDomain: "infrastructure",
+            failureComponent: "git-mirror",
+            failureCode: "git-mirror-fetch-completed",
+            summary: "Git mirror 源码获取完成",
+            retryPhase: "initialAttempt",
+            retryAttempt: 1,
+            retryMaxAttempts: 3,
+            createdAt: "2026-07-20T10:00:03.000Z"
+          }]
+        }
+      }
+    });
+    await nextTick();
+
+    expect(wrapper.text()).not.toContain("基础设施故障");
+    expect(wrapper.findAll('[data-row-id^="event:semantic-retry:"]')).toHaveLength(0);
+    wrapper.unmount();
+  });
+
   it("keeps a tool row stable while projecting visual and accessibility state", async () => {
     const wrapper = mount(TraceTimeline, {
       props: {