agent (unreleased): the hub is told what the kernel clean-up did and what the profile refresh did (R-1383)

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

internal/osupdate/kernel.go

@@ -531,6 +531,8 @@ func (l *Leg) runKernelCleanup(ctx context.Context, runID string, vmid int, trig
 			gained = fmt.Sprintf("%.1f GiB", float64(*res.BytesGained)/(1<<30))
 		}
 		rep.Outcome, rep.Healthy = "cleaned", true
+		rep.KernelCleanup = &CleanupDetail{Removed: capNames(res.Removed, 40), Kept: capNames(sortedKeys(res.Kept), 40),
+			BytesGained: res.BytesGained, Leftovers: len(res.Leftovers)}
 		rep.HealthReason = truncate(fmt.Sprintf("removed %d old kernel package(s): %s; kept %s; %s gained; %d left-over path(s)",
 			len(res.Removed), strings.Join(res.Removed, ", "), strings.Join(sortedKeys(res.Kept), ", "), gained, len(res.Leftovers)), 600)
 		lg.Info("osupdate: kernel clean-up — old kernels removed", "removed", len(res.Removed), "names", strings.Join(res.Removed, ","),
@@ -564,6 +566,22 @@ func (l *Leg) KernelCleanupDryRun(ctx context.Context, vmid int) (json.RawMessag
 	return wr.KernelCleanup, nil
 }
 
+// capNames bounds a list that goes to the hub: at most n names, each at most 120 bytes; never nil (the hub reads
+// "removed: []" as "none", not as "unknown").
+func capNames(in []string, n int) []string {
+	out := make([]string, 0, len(in))
+	for _, x := range in {
+		if len(out) == n {
+			break
+		}
+		if len(x) > 120 {
+			x = x[:120]
+		}
+		out = append(out, x)
+	}
+	return out
+}
+
 func sortedKeys(m map[string][]string) []string {
 	out := make([]string, 0, len(m))
 	for k := range m {