App 2.27.3: read the cruise control target speed, log it raw

The head unit names a vendor float AAD_EPTCCTRGTSPD (0x2160A15B),
the cruise control target speed by its name. EVHardware reads it raw;
the Logs tab lists each change with time, speed and gear, to establish
the unit and the off value on the car. Emulator only (absent there).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

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

@@ -0,0 +1,18 @@
+package com.evsuite.abrp;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+/** The cruise control log's value format — pure JVM. */
+public class CruiseLogTest {
+
+    @Test
+    public void oneDecimalOrUnread() {
+        assertEquals("120.0", CruiseLog.format(120f));
+        assertEquals("33.3", CruiseLog.format(33.33f));
+        assertEquals("0.0", CruiseLog.format(0f));
+        assertEquals("unread", CruiseLog.format(null));
+        assertEquals("unread", CruiseLog.format(Float.NaN));
+    }
+}