- large_4kb_message_round_trips: 4096-byte payload echoes with pattern verification
- guest_reports_payload_length: guest computes and sends back payload length as LE i32
- alloc_returns_odd_alignment: alloc returns 1 (unaligned), host writes correctly
- shared_engine_clone_and_debug: cloned engine Debug output matches
- idle_ticks_dont_affect_wasm_actor: 500 empty ticks, then message still works
All 193 tests pass. No new bugs found.
Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski
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