hub v0.143.1 (code): Reply-To on household mails (decision 174); R7 told-kernel refusal is temporary (R-898 test)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

hub/internal/osupdates/kernel_test.go

@@ -282,3 +282,30 @@ func countOf(xs []string, x string) int {
 	}
 	return n
 }
+
+// R-898: a told kernel that can no longer be installed is refused by the box BEFORE any change (R7) — temporary, never
+// "ended for good": the box stays due, and once its report offers the newer kernel the household is told again (inside
+// the 3-mail limit). COMPANION RED-PROOF (observed): add "R7" to kernelRefusedForGood → "an R7 refusal ended the step".
+func TestKernel_ToldKernelGoneIsTemporaryAndTheNewerIsOffered(t *testing.T) {
+	f := newFix(t)
+	f.hostWithPendingKernel(t, "hp") // pending: 7.0.14-22
+	f.laneFacts(t, "hp", "c-hp", kOld, "none", "")
+	r := kreport("refused", "night", false)
+	r.Refused = json.RawMessage(`{"code":"R7","reason":"the simulation failed: E: Version '7.0.14-22' for 'proxmox-kernel-7.0' was not found"}`)
+	f.ingest(t, "hp", r)
+	if k, why := f.s.KernelDue("hp"); k != kNew {
+		t.Fatalf("an R7 refusal ended the step: %q %q", k, why)
+	}
+	// the next night's report offers a newer kernel → that one is due, and its household mail is a new one
+	f.ingest(t, "hp", Report{Layer: LayerHost, Trigger: "night", Mode: "apply", Outcome: "nothing", Healthy: true,
+		Pending: []PendingPkg{{Name: "proxmox-kernel-7.0", From: "7.0.2-6", To: "7.0.14-23", Origin: []string{"Proxmox Debian Repository"}}}})
+	if k, _ := f.s.KernelDue("hp"); k != "7.0.14-23-pve" {
+		t.Fatalf("the newer kernel is not offered: %q", k)
+	}
+	var sent []string
+	f.mail(&sent, nil)
+	f.now = budapest(t, 10)
+	if f.s.KernelNotify(); len(sent) != 1 || sent[0] != "c-hp:7.0.14-23-pve" {
+		t.Fatalf("the household must be told again for the newer kernel: %v", sent)
+	}
+}