test(android): compare each JNI descriptor with its Kotlin external fun, not only the name

android_conformance_test.zig checks that every native android_dispatch.zig registers has a matching external fun name in CraftNative.kt, and the reverse. It does not compare the JNI descriptor with the Kotlin parameter and return types.

A descriptor that disagrees with its external fun makes RegisterNatives refuse the whole table. Every action then falls back to Kotlin: the shim leg still passes, and only the runtime E2E leg notices, as a missing registered 103 natives line, after a full emulator run. #215 changed one descriptor, nativeDispatchDeepLink to (Ljava/lang/String;Z)Z, and pinned that one string in a Zig test. Only CI could show that it matches the Kotlin.

Suggested: parse each external fun name(params): Return in CraftNative.kt, map the handful of types the file uses to descriptor letters, and compare with natives:

• Activity → Landroid/app/Activity;
• String / String? → Ljava/lang/String;
• Boolean → Z
• Int → I
• ByteArray → [B
• WebView
• IntentSender
• Unit → V

This makes the whole class of mismatch a local test failure.