- Replace polling-based command completion with sentinel event detection in
persistent shell (eliminates I/O polling, immediate completion signaling)
- Add SSH PTY allocation (-tt) and safe UTF-8 decoding (errors=replace)
- Add retry with exponential backoff for transient instance creation failures
- Support eval_challenges list and eval_exclude_modules for flexible eval filtering
- Stream eval samples via log_eval_sample() for real-time HTML viewer
- Add tmux hint for interactive challenge shells
- Add capability verification stress test for pwn-dojo infrastructure
- Fix atroposlib dependency to resolve from git (not local path)
5a5d7ec2a2