Tests Lossless Projection Logic: Python @Reclaim(Tracing)->C++ shared_ptr, C++ @Deallocate(Explicit)->Python wrapper, @Owner(Single) preserved in Python metadata, round-trip annotation preservation, @Lifetime(RAII)-> unique_ptr. Defines CrossLanguageProjector interface. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>