diff --git a/src/cron/service.failure-alert-notifications.test.ts b/src/cron/service.failure-alert-notifications.test.ts
index d06b212c14f5..24115a23931c 100644
--- a/src/cron/service.failure-alert-notifications.test.ts
+++ b/src/cron/service.failure-alert-notifications.test.ts
@@ -7,7 +7,7 @@ import {
   resolveHeartbeatRunPrompt,
 } from "../infra/heartbeat-runner-prompt.js";
 import { startHeartbeatRunner } from "../infra/heartbeat-runner-scheduler.js";
-import { requestHeartbeat as requestHeartbeatWake } from "../infra/heartbeat-wake.js";
+import { requestHeartbeatAndWait } from "../infra/heartbeat-wake.js";
 import {
   drainSystemEvents,
   enqueueSystemEvent,
@@ -76,6 +76,7 @@ describe("CronService failure notification delivery", () => {
       threadId: 77,
     };
     const observed: Array<{ prompt: string; deliveryContext?: DeliveryContext }> = [];
+    const pendingWakes: Array<ReturnType<typeof requestHeartbeatAndWait>> = [];
     const runOnce = vi.fn(async (options: HeartbeatRunOptions) => {
       const pendingEventEntries = peekSystemEventEntries(options.sessionKey ?? "");
       const preflight = await resolveHeartbeatPreflight({
@@ -125,13 +126,17 @@ describe("CronService failure notification delivery", () => {
           contextKey: options?.contextKey,
           deliveryContext: options?.deliveryContext,
         }),
-      requestHeartbeat: (wake) =>
-        requestHeartbeatWake({
-          ...wake,
-          sessionKey:
-            wake.sessionKey ?? resolveAgentMainSessionKey({ cfg, agentId: wake.agentId ?? "main" }),
-          coalesceMs: 0,
-        }),
+      requestHeartbeat: (wake) => {
+        pendingWakes.push(
+          requestHeartbeatAndWait({
+            ...wake,
+            sessionKey:
+              wake.sessionKey ??
+              resolveAgentMainSessionKey({ cfg, agentId: wake.agentId ?? "main" }),
+            coalesceMs: 0,
+          }),
+        );
+      },
       sendCronFailureAlert,
       runIsolatedAgentJob: async () => ({
         status: "error",
@@ -156,6 +161,7 @@ describe("CronService failure notification delivery", () => {
         "failure alert channel unavailable",
       );
       await vi.advanceTimersByTimeAsync(1);
+      await Promise.all(pendingWakes);
 
       expect(peekSystemEventEntries(testCase.sessionKey)).toHaveLength(1);
       expect(runOnce).toHaveBeenCalledTimes(testCase.wakesNow ? 1 : 0);
@@ -182,8 +188,14 @@ describe("CronService failure notification delivery", () => {
       }
     } finally {
       cron.stop();
-      runner.stop();
-      drainSystemEvents(testCase.sessionKey);
+      try {
+        // Stopping the runner retains unfinished notifications for its successor.
+        await vi.advanceTimersByTimeAsync(1);
+        await Promise.all(pendingWakes);
+      } finally {
+        runner.stop();
+        drainSystemEvents(testCase.sessionKey);
+      }
     }
   });
 });
diff --git a/src/cron/service.heartbeat-busy-poll.test.ts b/src/cron/service.heartbeat-busy-poll.test.ts
index 8fedf7035f38..d3a76ea3fccc 100644
--- a/src/cron/service.heartbeat-busy-poll.test.ts
+++ b/src/cron/service.heartbeat-busy-poll.test.ts
@@ -289,9 +289,12 @@ describe("native heartbeat busy poll settlement", () => {
           await vi.advanceTimersByTimeAsync(firstTick - Date.now());
           await waitForRequest(1);
           expect(request).toHaveBeenCalledOnce();
+          await vi.advanceTimersByTimeAsync(250);
+          // Scratch preflight uses a real worker, which fake-clock advancement cannot join.
+          await runOnce.mock.results[0]?.value;
           // Observe the full original watchdog window on both versions. The
           // unfixed scheduler records a timeout; the fixed poll settled promptly.
-          await vi.advanceTimersByTimeAsync(600_001);
+          await vi.advanceTimersByTimeAsync(600_001 - 250);
           await waitForFinished(1);
           expect(finished()).toHaveLength(1);
           // Finished precedes schedule maintenance and release of the active marker.
@@ -423,6 +426,7 @@ describe("native heartbeat busy poll settlement", () => {
           monitor,
           sessionKey,
           reply,
+          runOnce,
           request,
           waitForRequest,
           finished,
@@ -443,6 +447,7 @@ describe("native heartbeat busy poll settlement", () => {
           await waitForRequest(1);
           expect(request).toHaveBeenCalledOnce();
           await vi.advanceTimersByTimeAsync(250);
+          await runOnce.mock.results[0]?.value;
           expect(finished()).toHaveLength(0);
           expect(peekSystemEventEntries(sessionKey).map((entry) => entry.text)).toContain(text);
           expect(reply).not.toHaveBeenCalled();
@@ -544,12 +549,14 @@ describe("native heartbeat busy poll settlement", () => {
         await waitForRequest(1);
         expect(request).toHaveBeenCalledOnce();
         await vi.advanceTimersByTimeAsync(250);
+        await runOnce.mock.results[0]?.value;
         expect(deps.isReplyRunActive).toHaveBeenCalledTimes(2);
         expect(finished()).toHaveLength(0);
         expect(reply).not.toHaveBeenCalled();
         const releaseMain = await holdLane(CommandLane.Main);
         await vi.advanceTimersByTimeAsync(60_000);
         expect(runOnce).toHaveBeenCalledTimes(2);
+        await runOnce.mock.results[1]?.value;
         expect(finished()).toHaveLength(0);
         await releaseMain();
         await vi.advanceTimersByTimeAsync(60_000);
diff --git a/src/infra/update-candidate-canary-progress.test-support.ts b/src/infra/update-candidate-canary-progress.test-support.ts
index 52ea7f8e5785..968db3bbcbe0 100644
--- a/src/infra/update-candidate-canary-progress.test-support.ts
+++ b/src/infra/update-candidate-canary-progress.test-support.ts
@@ -18,6 +18,7 @@ import { SqliteWorkerError } from "./sqlite-worker-contract.js";
 import { validateUpdateCandidateCanary } from "./update-candidate-canary.js";
 import { stubHealthyGateway } from "./update-candidate-canary.test-support.js";
 import * as candidateIo from "./update-candidate-io.js";
+import { UpdateRequesterRevokedError } from "./update-requester-authority.js";
 import { createUpdateRun, getUpdateRunAsync } from "./update-run-ledger.js";
 import { updateRunStepsFromResultStep } from "./update-run-step.js";
 
@@ -129,6 +130,7 @@ export function registerCanaryProgressWorkerTests(
           }
         }
       };
+      const onStepComplete = vi.fn();
       const pending = Promise.resolve().then(() =>
         validateUpdateCandidateWithProgress(
           {
@@ -138,7 +140,7 @@ export function registerCanaryProgressWorkerTests(
             assertCurrent: guards.assertCurrent,
             writeOptions,
           },
-          { opts: { json: true }, progress: {} },
+          { opts: { json: true }, progress: { onStepComplete } },
           run,
         ),
       );
@@ -160,48 +162,38 @@ export function registerCanaryProgressWorkerTests(
           expect(mocks.spawn).not.toHaveBeenCalled();
           return;
         }
-        if (outcome === "interrupted-after-acceptance") {
-          const observed = await pending.then(
-            (result) => ({ result }),
-            (error: unknown) => ({ error }),
-          );
+        if (outcome === "revoked-at-commit" || outcome === "interrupted-after-acceptance") {
+          await expect(pending).rejects.toBeInstanceOf(UpdateRequesterRevokedError);
           expect(checkedCommit).toBe(true);
           const saved = await getUpdateRunAsync(run.runId, { env });
-          expect(saved?.steps).toContainEqual(
+          if (outcome === "revoked-at-commit") {
+            expect(saved).toEqual(created);
+          } else {
+            expect(saved?.steps).toContainEqual(
+              expect.objectContaining({
+                step: "candidate-state-snapshot",
+                status: "in_progress",
+                detail: expect.stringContaining("completed, attempt 1, 920445/920445 pages"),
+              }),
+            );
+          }
+          expect(onStepComplete).toHaveBeenCalledWith(
             expect.objectContaining({
-              step: "candidate-state-snapshot",
-              status: "in_progress",
-              detail: expect.stringContaining("completed, attempt 1, 920445/920445 pages"),
-            }),
-          );
-          expect(observed).toMatchObject({
-            result: {
-              status: "error",
-              phase: "snapshot",
-              steps: expect.arrayContaining([
+              name: "candidate-state-snapshot",
+              exitCode: 1,
+              failureFacts: expect.arrayContaining([
                 expect.objectContaining({
-                  exitCode: 1,
-                  failureFacts: expect.arrayContaining([
-                    expect.objectContaining({
-                      message: expect.stringContaining("requester-revoked"),
-                    }),
-                  ]),
+                  message: expect.stringContaining("requester-revoked"),
                 }),
               ]),
-            },
-          });
+            }),
+          );
           expect(mocks.spawn).not.toHaveBeenCalled();
           return;
         }
         const result = await pending;
         expect(checkedCommit).toBe(true);
         const saved = await getUpdateRunAsync(run.runId, { env });
-        if (outcome === "revoked-at-commit") {
-          expect(result).toMatchObject({ status: "error", phase: "snapshot" });
-          expect(saved).toEqual(created);
-          expect(mocks.spawn).not.toHaveBeenCalled();
-          return;
-        }
         expect(result.status).toBe("ok");
         expect(saved?.steps).toContainEqual(
           expect.objectContaining({