fix(nitrogen): preserve ULong callbacks across JNI

[mrousavy]

Kotlin mangles callback methods that use ULong, so the generated JNI lookup and native registration cannot resolve their names. Add an invoke_jni adapter with a stable name and use Long only inside the JNI bridge. The Kotlin API remains (ULong) -> ULong, and conversions preserve all 64 bits, including values above Long.MAX_VALUE.

This follows #1591, which is now merged. This PR targets main and includes the unsigned callback E2E tests and their generated bindings. Long/void coverage and the primitive boxing simplification were merged in #1591.

Validation:

• 22 selected Android Harness E2E tests passed before the rebase, including UInt64 roundtrips through ULong.MAX_VALUE on both C++ and Kotlin backends.
• 42 direct Android JNI checks passed, including nullable ULong, unsigned boundary values, and void callbacks in both directions.
• Android debug build, TypeScript builds/typechecks, lint, and generated-file reproducibility passed before the rebase.
• Rebased cleanly onto main after fix(nitrogen): look up Kotlin callbacks with a boxed return type #1591 merged; git range-diff confirms the ULong patch is unchanged.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
nitro-docs	Skipped		Sep 7, 2026 7:20pm UTC