App 2.15.0: queued live data survives restarts

Unsent live samples were kept in memory only, so a reboot or a killed
process during a dead spot lost them. The queue is now saved to
files/telemetry_queue.json with AtomicFile, at most every 5 minutes and
only after a change (the flash is not written every 15 s), and at once
when the service stops; it is restored, oldest first and within the
2000-sample cap, when the service starts. A damaged file restores
nothing rather than failing. Tested on the emulator across a reboot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

app/src/test/java/com/evsuite/abrp/TelemetryQueueTest.java

@@ -1,6 +1,7 @@
 package com.evsuite.abrp;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.util.List;
 
@@ -37,4 +38,46 @@ public class TelemetryQueueTest {
         assertEquals(List.of("c", "d", "e"), queue.peekBatch());
         assertEquals(2, queue.dropped());
     }
+
+    @Test
+    public void aSavedQueueComesBackInOrder() {
+        TelemetryQueue q = new TelemetryQueue(10);
+        q.add("{\"utc\":1}");
+        q.add("{\"utc\":2}");
+        TelemetryQueue restarted = new TelemetryQueue(10);
+        restarted.add("{\"utc\":3}");                 // taken after the restart
+        assertEquals(2, restarted.restore(q.encode()));
+        assertEquals(java.util.Arrays.asList("{\"utc\":1}", "{\"utc\":2}", "{\"utc\":3}"), restarted.peekBatch());
+    }
+
+    @Test
+    public void restoringKeepsTheCapacityByDroppingTheOldest() {
+        TelemetryQueue q = new TelemetryQueue(10);
+        for (int i = 1; i <= 4; i++) q.add("{\"utc\":" + i + "}");
+        TelemetryQueue small = new TelemetryQueue(3);
+        small.restore(q.encode());
+        assertEquals(java.util.Arrays.asList("{\"utc\":2}", "{\"utc\":3}", "{\"utc\":4}"), small.peekBatch());
+        assertEquals(1, small.dropped());
+    }
+
+    @Test
+    public void aDamagedFileRestoresNothing() {
+        TelemetryQueue q = new TelemetryQueue(10);
+        assertEquals(0, q.restore("[\"{\\\"utc\\\":1}\", trunc"));
+        assertEquals(0, q.restore(""));
+        assertEquals(0, q.restore(null));
+        assertEquals(0, q.size());
+    }
+
+    @Test
+    public void everyChangeMovesTheVersion() {
+        TelemetryQueue q = new TelemetryQueue(10);
+        long v0 = q.version();
+        q.add("{\"utc\":1}");
+        long v1 = q.version();
+        q.remove(0);
+        assertEquals(v1, q.version());                     // nothing removed, nothing to save
+        q.remove(1);
+        assertTrue(q.version() > v1 && v1 > v0);
+    }
 }