test: verify provenance endpoint returns tracing data after generation

e2e/tests/generation-live.spec.ts

@@ -268,5 +268,24 @@ test.describe('Live generation with OpenAI', () => {
         // Some sites block HEAD requests — skip rather than fail
       }
     }
+
+    // ═══════════════════════════════════════════════════════════════
+    // Provenance verification
+    // ═══════════════════════════════════════════════════════════════
+    const provResp = await apiCall(page, 'GET', `/api/v1/syntheses/${synthesisId}/provenance`);
+    expect(provResp.status).toBe(200);
+    const provenance = provResp.data;
+    expect(Array.isArray(provenance)).toBe(true);
+    expect(provenance.length).toBeGreaterThan(0);
+
+    // At least some entries should be 'used'
+    const usedEntries = provenance.filter((e: any) => e.status === 'used');
+    expect(usedEntries.length).toBeGreaterThan(0);
+
+    // Every used entry should have a synthesis_id matching this synthesis
+    for (const entry of usedEntries) {
+      expect(entry.synthesis_id).toBe(synthesisId);
+      expect(entry.job_id).toBeTruthy();
+    }
   });
 });