v0.306.0: R-570 — the off-site note decides on its kind only; the pre-0.251.0 text fallback is deleted

Fleet condition read on each box's settings.json 2026-10-10 (offbox.last_success ~02:16Z on 0.304.0).
Red-proof: the new no-kind row of TestR553_StaleNoteDecisionSurvivesWordingChange failed against the fallback.

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

controller/internal/backup/offsite_diag_test.go

@@ -156,37 +156,6 @@ func backupNoteHU(t *testing.T, key string) string {
 	return newNoteManager(t).note(key)
 }
 
-// TestR570SentenceStaysHungarian — the ONE saved note release C may not translate.
-//
-// A box upgraded to 0.251.0 carries the OLD persisted warning with no kind until its next off-site
-// run rewrites it, so `offboxWarningDisplay` still falls back to a substring test on those words when
-// the kind is empty (R-553's documented exception). Translating the PRODUCER while that fallback is
-// load-bearing would strand exactly the boxes the fallback exists for: their stale note would stop
-// being recognised and would keep telling a household that nothing is covered.
-//
-// **Delete this test when R-570 closes** — it is named for the row on purpose.
-//
-// RED-PROOF (REPORT): turn the producer into m.note("…") → this test fails naming the line.
-func TestR570SentenceStaysHungarian(t *testing.T) {
-	const sentence = "Ez a futás semmit nem mentett: nincs mentésre jelölt alkalmazás"
-	src, err := os.ReadFile("offbox.go")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !strings.Contains(string(src), `"`+sentence+`"`) {
-		t.Errorf("the R-570 producer no longer writes %q as a literal — a box that has not run off-site "+
-			"since 0.251.0 carries that exact text with no kind, and offboxWarningDisplay finds it by "+
-			"those words. Translating it strands them. Close R-570 first.", sentence)
-	}
-	// And the sentence must not have quietly acquired a bundle key either: a key would render
-	// Hungarian today and something else the day someone adds a translation.
-	for _, k := range []string{"note.offsite.no_apps_selected", "note.offsite.zero_toggle"} {
-		if strings.Contains(string(src), k) {
-			t.Errorf("the R-570 producer now names a bundle key (%s) — same problem, one step further away", k)
-		}
-	}
-}
-
 // TestNoteHelpersAreNotCalledUnderTheSettingsLock — release C (R-557), and it is a REGRESSION test,
 // not a precaution.
 //