A/B test: from-scratch minimal small widget (proven medium intent)

Temporary FuelBoardTestSmallWidget kind: a small-face widget driven by
the PROVEN medium intent (fuel/sort/distance only — no favourite params,
no dependency, no custom entity query), registered first in the gallery.
Isolates small SIZE vs small INTENT: if it populates while
FuelPriceSmallWidget skeletons, the small intent's extra machinery is the
culprit; if it also skeletons, the failure is small-family/system-level.
Provider gains a beaconTag so the test widget's beacons are
distinguishable in the relay log and keychain slots. Removed once the
root cause is confirmed.

FuelBoardWidgets/FuelPriceWidget.swift

@@ -85,6 +85,35 @@ struct FuelPriceSmallWidget: Widget {
     }
 }
 
+// A/B TEST widget (temporary): a from-scratch SMALL widget driven by the
+// PROVEN medium intent — no favourite params, no dependency, no custom
+// query. If this populates while FuelPriceSmallWidget skeletons, the small
+// SIZE is fine and the small intent's extra machinery is the culprit. If it
+// ALSO skeletons, the failure is at the small-family/system level. Removed
+// once the root cause is confirmed.
+struct FuelBoardTestSmallWidget: Widget {
+    let kind = "FuelBoardTestSmallWidget"
+
+    var body: some WidgetConfiguration {
+        AppIntentConfiguration(
+            kind: kind,
+            intent: FuelBoardWidgetConfigurationIntent.self,
+            provider: FuelPriceTimelineProvider<FuelBoardWidgetConfigurationIntent>(
+                beaconTag: "FuelBoardTestSmallWidget"
+            )
+        ) { entry in
+            FuelPriceWidgetView(entry: entry)
+                .containerBackground(for: .widget) {
+                    Color(.systemBackground)
+                }
+        }
+        .configurationDisplayName("FuelBoard Small Test")
+        .description("A/B test: minimal small widget using the proven medium intent.")
+        .supportedFamilies([.systemSmall])
+        .disfavoredLocations([.carPlay], for: [.systemSmall])
+    }
+}
+
 struct FuelPriceEntry: TimelineEntry {
     let date: Date
     let stations: [FuelStation]   // already filtered + sorted per config
@@ -99,6 +128,12 @@ struct FuelPriceEntry: TimelineEntry {
 struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & WidgetConfigValues>: AppIntentTimelineProvider {
     typealias Intent = Configuration
 
+    /// Diagnostics beacon tag: empty → derive from the intent type name. A
+    /// widget kind that shares an intent (the A/B test small widget reuses the
+    /// medium intent) passes an explicit tag so its beacons stay
+    /// distinguishable in the relay log and keychain slots.
+    var beaconTag: String = ""
+
     func placeholder(in context: Context) -> FuelPriceEntry {
         let unit = FuelStore.loadDistanceUnit()
         let sample = SampleFuelProvider.sampleStations
@@ -128,7 +163,7 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
 
     private func makeEntry(configuration: Configuration) async -> FuelPriceEntry {
         let entry = await makeEntryCore(configuration: configuration)
-        Self.writeDiagBeacon(entry: entry)
+        writeDiagBeacon(entry: entry)
         return entry
     }
 
@@ -137,8 +172,8 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
     /// access log records that a widget timeline actually ran in the
     /// extension and what it produced. Deliberately outside the timeline
     /// result — can never affect rendering.
-    private static func writeDiagBeacon(entry: FuelPriceEntry) {
-        let intentType = String(describing: Configuration.self)
+    private func writeDiagBeacon(entry: FuelPriceEntry) {
+        let intentType = beaconTag.isEmpty ? String(describing: Configuration.self) : beaconTag
         let first = entry.stations.first
         let json = """
         {"intent":"\(intentType)","source":"\(entry.locationSource)",\