style(extend-app-start): Trim low-value comments in the headless fix

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: buenaflor

sentry-android-core/src/main/java/io/sentry/android/core/ActivityLifecycleIntegration.java

@@ -1024,21 +1024,19 @@ private void onHeadlessAppStart() {
       return;
     }
 
-    // Persist the end time so a later activity can decide whether its ui.load is close enough in
-    // time to continue this trace; without it the continuation window is treated as unbounded.
+    // Persist the end time so a later ui.load can tell whether it is close enough to continue this
+    // trace; without it the continuation window is unbounded.
     metrics.setAppStartEndTime(endTime);
 
     final @NotNull AppStartExtension extension = metrics.getAppStartExtension();
-    // Extended headless start still open: finish the existing eager txn at the headless end instead
-    // of creating a second one.
     if (extension.isActive()) {
+      // Extended start still open: finish the eager txn instead of creating a second one.
       extension.finishTransaction(endTime);
       return;
     }
-    // The extension already created and finished the standalone app.start for this launch
-    // (finishExtendedAppStart() or the deadline ran before this headless check). Don't duplicate
-    // it.
     if (!metrics.shouldSendStartMeasurements(true)) {
+      // The extension already created and finished this app.start (finishExtendedAppStart or the
+      // deadline); don't create a duplicate.
       return;
     }
 

sentry-android-core/src/test/java/io/sentry/android/core/ActivityLifecycleIntegrationTest.kt

@@ -453,8 +453,6 @@ class ActivityLifecycleIntegrationTest {
 
     driveHeadlessAppStart()
 
-    // Without persisting the end time, the continuation window is treated as unbounded and a later
-    // activity would wrongly continue this trace.
     assertNotNull(AppStartMetrics.getInstance().getAppStartEndTime())
   }
 
@@ -469,15 +467,14 @@ class ActivityLifecycleIntegrationTest {
 
     prepareHeadlessAppStart(appStartType = AppStartType.COLD)
     AppStartMetrics.getInstance().appStartExtension.extendAppStart()
-    // The user finishes the extension and its app.start is sent (onAppStartSpansSent, normally
-    // driven by the event processor) before the headless idle check runs.
+    // Finish and send the extension's app.start (onAppStartSpansSent is normally driven by the
+    // event processor) before the headless idle check runs.
     AppStartMetrics.getInstance().appStartExtension.finishExtendedAppStart()
     AppStartMetrics.getInstance().onAppStartSpansSent()
     val transactionsBefore = fixture.createdTransactions.size
 
     driveHeadlessAppStart()
 
-    // The eager extension txn already covered this launch; no second standalone app.start.
     assertEquals(transactionsBefore, fixture.createdTransactions.size)
   }