fix(android): restore missing bundle task warning via taskGraph.whenReady

Re-adds the diagnostic warn() that was lost when switching from tasks.named()
to tasks.configureEach. The check is deferred to gradle.taskGraph.whenReady
so all plugins' onVariants callbacks (including the RN plugin's) have completed
and tasks.names reflects the full set of registered tasks before we decide to
emit the warning.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: antonis

packages/core/sentry.gradle

@@ -320,6 +320,19 @@ plugins.withId('com.android.application') {
                     packageTask.finalizedBy modulesCleanUpTask
                 }
             }
+
+            // Warn if neither expected bundle task was registered by the time the task
+            // graph is resolved — by then all plugins' onVariants callbacks (including
+            // the React Native plugin's) have run, so tasks.names is complete.
+            gradle.taskGraph.whenReady {
+                if (bundleTaskNames.every { !tasks.names.contains(it) }) {
+                    project.logger.warn(
+                        "[sentry] No React Native bundle task found for variant '${v.name}'. " +
+                        "Expected 'createBundle${variantCapitalized}JsAndAssets' or " +
+                        "'bundle${variantCapitalized}JsAndAssets' — neither is registered. " +
+                        "Source maps will NOT be uploaded for this variant.")
+                }
+            }
         }
     }
 }