Adds ffi/codegen/kotlin.nim, wired into the targetLang dispatch and exposed
as the `genbindings_kotlin` nimble task. From the same metadata it emits both
artifacts an Android consumer needs over the native (zero-serialization) C
ABI from c.nim: an idiomatic Kotlin AutoCloseable wrapper and the JNI shim
that bridges it.
Callback-shape selection is per proc (ack / string / struct), and the JNI
shim blocks on a condvar until the FFI-thread callback fires so the Kotlin
side stays synchronous. An all-string struct return crosses as a String[]
that the wrapper repacks into a data class — matching the validated example.
Procs needing seq/Option params, multiple struct params, or a non-string
struct return are skipped with a logged notice so the generated code always
compiles. That marshaling, events, and async are the next increments.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
