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diff --git a/spike/settings/source/SpikeApp.mc b/spike/settings/source/SpikeApp.mc
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+// Author:  cirakg & claude ai
+// Summary: Settings spike entry point: analyses every setting on start and on each change, and writes a status back.
+//
+// The spike measures what Garmin doesn't document (README section 16, M1):
+// how long a text setting may be, which characters survive, whether values
+// the watch writes back reach the phone, and when onSettingsChanged fires.
+// It is a throwaway app with its own app id; nothing here is reused by OTP
+// Wallet except the measured numbers.
+
+import Toybox.Application;
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+class SpikeApp extends Application.AppBase {
+
+    // The analysis shown on screen, refreshed on start and on every change.
+    var report as SpikeReport;
+
+    function initialize() {
+        AppBase.initialize();
+        report = new SpikeReport();
+    }
+
+    // Read the values the watch already has (from the last sync).
+    function onStart(state as Dictionary?) as Void {
+        report.analyseOnStart();
+        DebugSelfTest.run(self);
+    }
+
+    function onStop(state as Dictionary?) as Void {
+    }
+
+    function getInitialView() as [Views] or [Views, InputDelegates] {
+        var view = new SpikeView(report);
+        return [view, new SpikeDelegate(view)];
+    }
+
+    // Called when you save the settings on the phone while the app runs.
+    function onSettingsChanged() as Void {
+        report.settingsChanged();
+        WatchUi.requestUpdate();
+    }
+}