feat(spec): the analytics result wire schema carries currencyField beside currency

Claude-Session: https://claude.ai/code/session_01Utp6Ca8jzC2P7EAQvqjNBb
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/src/api/analytics.zod.ts

@@ -102,7 +102,13 @@ export const AnalyticsResultResponseSchema = lazySchema(() => BaseResponseSchema
         + '`currency`, then the source field\'s fixed currency — its '
         + '`currencyConfig.defaultCurrency`, read only under `currencyMode: \'fixed\'` '
         + '— then the tenant default). Absent on non-monetary columns, which must '
-        + 'never render a symbol.',
+        + 'never render a symbol, and on a column that carries `currencyField`.',
+      ),
+      currencyField: z.string().optional().describe(
+        '[ADR-0144 D2] The PER-ROW currency of a measure column over a `currencyMode: \'record\'` '
+        + 'amount: the `name` of the dimension column in this answer that groups by the amount\'s '
+        + 'code field, whose value in each row is that row\'s ISO 4217 code. `currency` is absent '
+        + 'when this is present. Only on a `queryDataset` measure column.',
       ),
       percentScale: z.enum(['fraction', 'whole']).optional().describe(
         'The column\'s percent SCALE, when it is a percentage: `fraction` for a '