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

CHANGELOG.md

@@ -1,3 +1,18 @@
+## v0.306.0 — the off-site note decides on its kind only; the pre-0.251.0 text fallback is gone (R-570) (2026-10-10)
+
+**MinAgent: 0.131.0** (unchanged — no agent call changed). Released 2026-10-10 alone (no hub change).
+
+- **R-570 — the legacy text fallback in `offboxWarningDisplay` is deleted** (`internal/web/handlers.go`), with its
+  constant `offboxStaleWarningMarker`. It existed only for a box whose last off-site run predated v0.251.0 and so
+  carried the „nincs mentésre jelölt alkalmazás" note without a KIND. The row's condition is met, read on each box's
+  own `settings.json` on 2026-10-10: demo-hp, demo-felhom and Tester 1 each have `offbox.last_success`
+  2026-10-10 ~02:16Z on controller 0.304.0; Tester 2 was installed 2026-10-04 on a far newer controller. The page now
+  decides on `LastWarningKind` ONLY: the same words with no kind are shown verbatim. Red-proof:
+  `TestR553_StaleNoteDecisionSurvivesWordingChange`'s new row „no kind: the words alone decide nothing" FAILED against
+  the fallback (it returned the replacement) and passes without it. `TestR570SentenceStaysHungarian` is deleted (it
+  was named for this row and said so); `TestR240_ZeroSelectionRunDoesNotSaySuccess` no longer pins the words, only the
+  kind. The zero-selection note itself is unchanged and still Hungarian — localisation may now translate it.
+
 ## v0.305.0 — check first, stop second (R-921); a household's clear deletes the hub's address (R-922, controller half) (2026-10-10)
 
 **MinAgent: 0.131.0** (unchanged — R-921 reads only `GET /backup/tiers` and `GET /backup/status?target=`, both served