chore(spec): classify dataset measures.currency in the liveness gate

Author: os-zhuang

packages/spec/liveness/dataset.json

@@ -93,6 +93,11 @@
           "evidence": "packages/services/service-analytics/src/analytics-service.ts:480",
           "note": "compiled into Cube metric + enriched onto result fields for the renderer."
         },
+        "currency": {
+          "status": "live",
+          "evidence": "packages/services/service-analytics/src/analytics-service.ts:531",
+          "note": "measure-declared currency (ISO 4217) enriched onto result fields alongside label/format, so the renderer formats the amount with a locale-correct Intl symbol rather than a '$' baked into format."
+        },
         "certified": {
           "status": "dead",
           "evidence": "no runtime consumer — analytics execution never reads it; not compiled into the Cube",