docs: add E2E verification section back to jni README

Author: xaionaro@dx.center

README.md

@@ -335,6 +335,22 @@ flowchart TD
 | `make lint` | Run golangci-lint | golangci-lint |
 | `make clean` | Remove all generated files | -- |
 
+## E2E Test Verification
+
+The JNI bindings and generated Android API packages are verified via [jni-proxy](https://github.com/AndroidGoLab/jni-proxy) E2E tests against real hardware.
+
+<details>
+<summary>Verified platforms (click to expand)</summary>
+
+| Type | Device | Android | API | ABI | Build | Date | Passed | Total |
+|------|--------|---------|-----|-----|-------|------|--------|-------|
+| Phone | Pixel 8a | 16 | 36 | arm64-v8a | BP4A.260205.001 | 2026-03-15 | 21 | 21 |
+| Emulator | sdk_gphone64_x86_64 | 15 | 35 | x86_64 | | 2026-03-14 | 21 | 21 |
+
+Tests cover: JNI version, class operations, method lookup + call, string round-trip, object operations, handle lifecycle, field access, exception handling, and full integration workflows. Camera recording, microphone recording, GPS location, and battery status are also verified on the Pixel 8a.
+
+</details>
+
 ## Adding a New Android API Package
 
 1. Create `spec/java/{package}.yaml` with the Java class, methods, and `go_import` path.