chore(spec): regenerate the three artifacts the narrowing proved stale

`check:generated` named exactly three: `api-surface/` (+1 added, 0 breaking —
the new exported refinement check), `export-origins/ui.json` (same symbol), and
`content/docs/references/ui/dashboard.mdx` (the `values` doc string now states
the arity rule it enforces). The other twelve were already current, including
`authorable-surface/` — no authorable key moves here.

Claude-Session: https://claude.ai/code/session_01JbZnqu8bt6YqfJsr9vaFb3
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

content/docs/references/ui/dashboard.mdx

@@ -76,7 +76,7 @@ const result = DashboardSchema.parse(data);
 | **compareTo** | `{ kind: Enum<'previousPeriod' \| 'previousYear'>; dimension?: string }` | optional | Period-over-period comparison window (`{ kind, dimension? }`) |
 | **dataset** | `string` | ✅ | Dataset name to bind (ADR-0021) |
 | **dimensions** | `string[]` | optional | Dimension names — X/group/split |
-| **values** | `string[]` | ✅ | Measure names — Y (at least one) |
+| **values** | `string[]` | ✅ | Measure names — Y (at least one; exactly one on the metric/kpi/gauge/solid-gauge/bullet family) |
 | **layout** | `{ x: number; y: number; w: number; h: number }` | optional | Grid layout position (auto-flowed when omitted) |
 | **options** | `{ dateGranularity?: Enum<'day' \| 'week' \| 'month' \| 'quarter' \| 'year'>; sortBy?: string; sortOrder?: Enum<'asc' \| 'desc'>; limit?: integer; … } & Record<string, any>` | optional | Widget specific configuration |
 | **filterBindings** | `Record<string, string \| false>` | optional | Per-widget dashboard-filter bindings: filter name → this widget's field, or false to opt out |
@@ -181,7 +181,7 @@ Dashboard header action
 | **compareTo** | `{ kind: Enum<'previousPeriod' \| 'previousYear'>; dimension?: string }` | optional | Period-over-period comparison window (`{ kind, dimension? }`) |
 | **dataset** | `string` | ✅ | Dataset name to bind (ADR-0021) |
 | **dimensions** | `string[]` | optional | Dimension names — X/group/split |
-| **values** | `string[]` | ✅ | Measure names — Y (at least one) |
+| **values** | `string[]` | ✅ | Measure names — Y (at least one; exactly one on the metric/kpi/gauge/solid-gauge/bullet family) |
 | **layout** | `{ x: number; y: number; w: number; h: number }` | optional | Grid layout position (auto-flowed when omitted) |
 | **options** | `{ dateGranularity?: Enum<'day' \| 'week' \| 'month' \| 'quarter' \| 'year'>; sortBy?: string; sortOrder?: Enum<'asc' \| 'desc'>; limit?: integer; … } & Record<string, any>` | optional | Widget specific configuration |
 | **filterBindings** | `Record<string, string \| false>` | optional | Per-widget dashboard-filter bindings: filter name → this widget's field, or false to opt out |

packages/spec/api-surface/ui.json

@@ -443,6 +443,7 @@
     "chartAggregateCategoryKey (function)",
     "chartAggregateResultKeys (function)",
     "chartAggregateValueKey (function)",
+    "checkDashboardWidgetMetricMeasureArity (function)",
     "checkDashboardWidgetStageOrder (function)",
     "checkGlobalFilterDateDefaultValue (function)",
     "checkListViewCalendarVisualization (function)",

packages/spec/export-origins/ui.json

@@ -429,6 +429,7 @@
     "chartAggregateCategoryKey": "src/ui/chart-aggregate.ts#chartAggregateCategoryKey (function)",
     "chartAggregateResultKeys": "src/ui/chart-aggregate.ts#chartAggregateResultKeys (function)",
     "chartAggregateValueKey": "src/ui/chart-aggregate.ts#chartAggregateValueKey (function)",
+    "checkDashboardWidgetMetricMeasureArity": "src/ui/dashboard.zod.ts#checkDashboardWidgetMetricMeasureArity (function)",
     "checkDashboardWidgetStageOrder": "src/ui/dashboard.zod.ts#checkDashboardWidgetStageOrder (function)",
     "checkGlobalFilterDateDefaultValue": "src/ui/dashboard.zod.ts#checkGlobalFilterDateDefaultValue (function)",
     "checkListViewCalendarVisualization": "src/ui/view.zod.ts#checkListViewCalendarVisualization (function)",