Merge all changes

src/Scheduler/__Tests/StellaOps.Scheduler.Worker.Tests/Heartbeat/HeartbeatTimeoutTests.cs

@@ -162,6 +162,7 @@ public sealed class HeartbeatTimeoutTests
 
         // Assert
         var recoveredJob = await jobStore.GetJobAsync(jobId);
+        Assert.NotNull(recoveredJob);
         recoveredJob.State.Should().Be(JobState.Pending, "stale job should be reset to pending");
         recoveredJob.LockHolder.Should().BeNull("stale lock should be released");
 
@@ -215,6 +216,7 @@ public sealed class HeartbeatTimeoutTests
 
         // Assert
         var jobAfterCleanup = await jobStore.GetJobAsync(jobId);
+        Assert.NotNull(jobAfterCleanup);
         jobAfterCleanup.State.Should().Be(JobState.Processing, "active job should not be reset");
         jobAfterCleanup.LockHolder.Should().Be("active-worker", "active lock should be preserved");