v0.6.0

What's Changed

• Add screenshot subcommand for virtual-terminal screen capture by @yusukeshib in #9
• refactor: split screen rendering into render.rs; add State::is_terminal by @yusukeshib in #10
• feat: agent-driving controls (expect, key, flag, …) + agent-readable --help by @yusukeshib in #11

Full Changelog: v0.5.1...v0.6.0