- guest_xor_transform_key: loop-based XOR cipher with 0xAA key
- actor_address_reconstructible_from_bytes: ActorAddress round-trips through raw bytes
- double_guest_watch_fires_once_on_stop: double works + watch notifies exactly once
- byte_message_various_constructors: ByteMessage from string, empty, 1024 zeros
All 220 tests pass. No new bugs found.
Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski