[iris] Include per-job autoscaler hint in GetJobStatus

[rjpower]

The hint was dropped from GetJobStatus because rebuilding the full routing table per call was 35% of wall time. #4848 now caches the per-job hint dict per evaluate() cycle, so the lookup is a single dict get — attach this job's hint without serializing the routing decision.

[claude]

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The new GetJobStatus hint-attach path at service.py#L1232-L1239 mirrors the existing ListJobs formatter at service.py#L1365-L1372, so both endpoints emit the same Scheduler: … / Autoscaler: (scaling up) … format. _get_autoscaler_pending_hints() safely returns {} when no autoscaler is configured, and the per-cycle cache the comment cites (#4848) is confirmed at autoscaler/runtime.py#L583-L591. Test updates correctly flip the prior negative assertions to positive substring checks and add a (scaling up) prefix check.
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[claude]

Code review

No issues found. Checked for bugs and AGENTS.md compliance.

The GetJobStatus hint-attach path at lib/iris/src/iris/cluster/controller/service.py#L1232-L1239 mirrors the existing ListJobs formatter at service.py#L1365-L1372, so both endpoints emit the same Scheduler: … / Autoscaler: (scaling up) … format. _get_autoscaler_pending_hints() safely returns {} when no autoscaler is configured, and the per-cycle cache referenced in the comment (#4848) is confirmed at autoscaler/runtime.py#L583-L591. Test updates correctly flip the previous negative assertions to positives and add a (scaling up) prefix check.

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