Fix stale NDK version and usage paths in e2e scripts

- Update run.sh default NDK_VERSION from 27.2.12479018 to 28.0.13004108
- Fix usage comments to reference tests/e2e/ paths

Author: xaionaro@dx.center

tests/e2e/run-examples.sh

@@ -9,7 +9,7 @@
 #   - Android NDK installed (auto-detected or set ANDROID_NDK_HOME)
 #   - A running Android emulator or device (adb accessible)
 #
-# Usage: ./e2e/run-examples.sh
+# Usage: ./tests/e2e/run-examples.sh
 
 set -euo pipefail
 

tests/e2e/run.sh

@@ -7,15 +7,15 @@
 #   - KVM available (/dev/kvm)
 #   - ANDROID_HOME set (e.g., ~/android-sdk)
 #
-# Usage: ./e2e/run.sh
+# Usage: ./tests/e2e/run.sh
 
 set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PROJECT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
 
 : "${ANDROID_HOME:?ANDROID_HOME must be set}"
-NDK_VERSION="${NDK_VERSION:-27.2.12479018}"
+NDK_VERSION="${NDK_VERSION:-28.0.13004108}"
 API_LEVEL="${API_LEVEL:-35}"
 AVD_NAME="${AVD_NAME:-ndk_e2e}"
 SYSTEM_IMAGE="system-images;android-${API_LEVEL};google_apis;x86_64"