test(FN-5003): assert noop audit emission in merge recovery

Fusion-Task-Id: FN-5003
Fusion-Task-Lineage: c5f1f326-934b-4cfc-8ba9-a2ac70a4f4f4

packages/engine/src/__tests__/merge-error-recovery.test.ts

@@ -72,6 +72,7 @@ type MockTaskStore = {
   logEntry: ReturnType<typeof vi.fn>;
   getActiveMergingTask: ReturnType<typeof vi.fn>;
   createTask: ReturnType<typeof vi.fn>;
+  recordRunAuditEvent: ReturnType<typeof vi.fn>;
   on: ReturnType<typeof vi.fn>;
   off: ReturnType<typeof vi.fn>;
 };
@@ -129,6 +130,7 @@ function makeStore({
       id: "FN-9999",
       description: input.description,
     })),
+    recordRunAuditEvent: vi.fn(async () => undefined),
     on: vi.fn(),
     off: vi.fn(),
   };
@@ -765,6 +767,17 @@ describe("ProjectEngine merge error recovery", () => {
       expect.stringContaining("[verification] post-finalize verification failed for already-on-main fast-path; no action"),
       "VerificationError",
     );
+    expect(store.recordRunAuditEvent).toHaveBeenCalledWith(expect.objectContaining({
+      domain: "database",
+      mutationType: "task:post-finalize-verification-no-op",
+      target: TASK_ID,
+      metadata: expect.objectContaining({
+        taskId: TASK_ID,
+        commitSha: "abcdef1234567890",
+        failedCommand: null,
+        exitCode: null,
+      }),
+    }));
   });
 
   it("moves task back to in-progress with merge-remediation status on verification errors", async () => {

packages/engine/src/project-engine.ts

@@ -1573,10 +1573,33 @@ export class ProjectEngine {
               const shortSha = typeof commitSha === "string" && commitSha.length > 0
                 ? commitSha.slice(0, 8)
                 : "unknown";
+              const failedCommand = err instanceof VerificationError
+                ? err.verificationResult?.testResult?.command ?? err.verificationResult?.buildResult?.command ?? null
+                : null;
+              const exitCode = err instanceof VerificationError
+                ? err.verificationResult?.testResult?.exitCode ?? err.verificationResult?.buildResult?.exitCode ?? null
+                : null;
               const errorTail = errorMsg.length > 200 ? `${errorMsg.slice(0, 200)}…` : errorMsg;
               const message = `[verification] post-finalize verification failed for already-on-main fast-path; no action (commit=${shortSha}, error=${errorTail})`;
               await store.logEntry(taskId, message, "VerificationError").catch(() => undefined);
               runtimeLog.log(`Auto-merge: ${taskId} ${message}`);
+              const auditor = createRunAuditor(store, {
+                runId: generateSyntheticRunId("auto-merge", taskId),
+                agentId: "auto-merge",
+                taskId,
+                phase: "merge",
+              });
+              await auditor.database({
+                type: "task:post-finalize-verification-no-op",
+                target: taskId,
+                metadata: {
+                  taskId,
+                  commitSha,
+                  failedCommand,
+                  exitCode,
+                  errorTail,
+                },
+              }).catch(() => undefined);
               continue;
             }