Establish native Linux ARM64 Android CI and verification gates (#94)

docs/android/architecture.md

@@ -66,11 +66,12 @@ policy. The installed android-37.0 SDK reports an empty codename and
 PreviewSdkInt=0 (revision 2); verify the same package metadata in CI before
 pinning the build, rather than relying on preview wording in older instructions.
 
-Release ABIs: **arm64-v8a**, **armeabi-v7a**, **x86_64**, corresponding to
-**aarch64-linux-android**, **armv7-linux-androideabi**,
-**x86_64-linux-android**. An ABI may be removed only with a dependency audit and
-an amendment to this decision; emulator success alone proves no arm64 hardware
-coverage. All shipped native dependencies, including JNA, must pass ELF LOAD
+Release ABIs: **arm64-v8a** and **armeabi-v7a**, corresponding to
+**aarch64-linux-android** and **armv7-linux-androideabi**. On 2026-10-08 the user
+removed x86_64 Android from the support and CI requirements and specified
+emulator-only testing for every issue. This supersedes the original three-ABI
+decision in #88; historical test evidence remains historical.
+All shipped native dependencies, including JNA, must pass ELF LOAD
 alignment, APK ZIP alignment and actual 16 KB runtime checks. Do not depend on
 compatibility mode. [Android's page-size guidance](https://developer.android.com/guide/practices/page-sizes)
 requires auditing dependencies as well as the app library.