t377: raise the logger level in the test, or it asserts on an empty list

The 9 tests the member wrote failed 7 of 9 on first build. The production
code was correct; the test harness was not. logback-test.xml sets
dev.ltms.fleet to WARN, so the INFO shape lines were dropped by the level
check before any appender saw them.

The member copied attach()/detach() from MemberTrustModelReportTest but not
the setLevel(INFO) those siblings do at each call site. Doing it inside
attach()/detach() covers all nine at once, and restores the original level
(null, meaning inherit) rather than a concrete one.

Proven by mutation: making the code log the value fails 4 tests, including
theValueNeverAppearsInLogOutput — 'the full GITEA_HOST value must never
reach the log'. Full build 1459 tests green.

fleetd/src/test/java/dev/ltms/fleet/GitHostShapeReportTest.java

@@ -39,8 +39,26 @@ class GitHostShapeReportTest {
         return FleetConfig.load(f);
     }
 
+    /**
+     * The level this logger had before {@link #attach()} raised it, so {@link #detach} can put it
+     * back. {@code null} is a real value here — it means "inherit from the parent" — and that is
+     * exactly the state this logger starts in, so it must be restored as {@code null} rather than
+     * as some concrete level.
+     */
+    private static Level originalLevel;
+
+    /**
+     * fleetd #377: the shape lines are logged at INFO, and {@code logback-test.xml} sets
+     * {@code dev.ltms.fleet} to WARN — so INFO events are dropped by the level check BEFORE any
+     * appender sees them. Attaching an appender is therefore not enough: without raising the level
+     * the list stays empty and every assertion below fails against correct production code. The
+     * sibling report tests do the same thing at each call site (see
+     * {@code MemberTrustModelReportTest}); doing it here keeps it in one place.
+     */
     private static ListAppender<ILoggingEvent> attach() {
         Logger logger = (Logger) LoggerFactory.getLogger(Fleetd.class);
+        originalLevel = logger.getLevel();
+        logger.setLevel(Level.INFO);
         ListAppender<ILoggingEvent> appender = new ListAppender<>();
         appender.start();
         logger.addAppender(appender);
@@ -48,7 +66,9 @@ class GitHostShapeReportTest {
     }
 
     private static void detach(ListAppender<ILoggingEvent> appender) {
-        ((Logger) LoggerFactory.getLogger(Fleetd.class)).detachAppender(appender);
+        Logger logger = (Logger) LoggerFactory.getLogger(Fleetd.class);
+        logger.detachAppender(appender);
+        logger.setLevel(originalLevel);
     }
 
     private static List<String> messages(ListAppender<ILoggingEvent> appender) {