refactor(ui): share read-only status badges

docs/CODE-BOUNDARIES.md

@@ -748,3 +748,14 @@ option identity/order, bounds, parsing, draft values, input/change timing and
 teardown. CCTV effective-pose conversion and tuner/device operations remain
 feature responsibilities. A Vue replacement can reuse this contract and CSS;
 it replaces DOM construction, rather than adding a second state owner.
+
+### Read-only status badges
+
+`src/ui/statusBadge.js` constructs/updates ordinary badges without listeners,
+status inference or live-region policy. It consumes translated text and controlled
+visibility; appearance variants share CSS rather than mapping machine states to
+universal severity. CCTV owns frame/source and calibration rules and their data
+attributes, while Weather owns coverage labels. The keyed rail-card owner keeps
+node identity, header focus, disclosure and teardown. The shared adapter never
+creates another state store or announces all card updates. A Vue view can replace
+this adapter and retain these presentation inputs and styles.