chore: import upstream snapshot with attribution

apps/sim/lib/copilot/request/session/recovery.test.ts

@@ -0,0 +1,38 @@
+/**
+ * @vitest-environment node
+ */
+
+import { describe, expect, it, vi } from 'vitest'
+
+const { getLatestSeq, getOldestSeq, readEvents } = vi.hoisted(() => ({
+  getLatestSeq: vi.fn(),
+  getOldestSeq: vi.fn(),
+  readEvents: vi.fn(),
+}))
+
+vi.mock('./buffer', () => ({
+  getLatestSeq,
+  getOldestSeq,
+  readEvents,
+}))
+
+import { checkForReplayGap } from './recovery'
+
+describe('checkForReplayGap', () => {
+  it('uses the latest buffered request id when run metadata is missing it', async () => {
+    getOldestSeq.mockResolvedValue(10)
+    getLatestSeq.mockResolvedValue(12)
+    readEvents.mockResolvedValue([
+      {
+        trace: { requestId: 'req-live-123' },
+      },
+    ])
+
+    const result = await checkForReplayGap('stream-1', '1')
+
+    expect(readEvents).toHaveBeenCalledWith('stream-1', '11')
+    expect(result?.gapDetected).toBe(true)
+    expect(result?.envelopes[0].trace.requestId).toBe('req-live-123')
+    expect(result?.envelopes[1].trace.requestId).toBe('req-live-123')
+  })
+})