🤖 fix: skip stale-generation status writes during retry

When retrying CoderControlPlane status updates, skip writes if the latest
resource generation no longer matches `nextStatus.ObservedGeneration`.
This prevents older reconciles from overwriting fresher status computed by
newer reconciles while still retaining conflict retry behavior.

---

_Generated with `mux` • Model: `openai:gpt-5.3-codex` • Thinking: `xhigh` • Cost: `$1.21`_

<!-- mux-attribution: model=openai:gpt-5.3-codex thinking=xhigh costs=1.21 -->

Author: ThomasK33

internal/controller/codercontrolplane_controller.go

@@ -1087,6 +1087,12 @@ func (r *CoderControlPlaneReconciler) reconcileStatus(
 			return fmt.Errorf("assertion failed: fetched object %s/%s does not match expected %s/%s",
 				latest.Namespace, latest.Name, namespacedName.Namespace, namespacedName.Name)
 		}
+		if nextStatus.ObservedGeneration > 0 && latest.Generation != nextStatus.ObservedGeneration {
+			// A newer reconcile has observed a newer generation. Avoid overwriting
+			// status with stale data from an older reconcile attempt.
+			coderControlPlane.Status = latest.Status
+			return nil
+		}
 		if equality.Semantic.DeepEqual(latest.Status, nextStatus) {
 			coderControlPlane.Status = latest.Status
 			return nil