[Feature] Terminal Compatibility Check

[VascoSch92]

Summary

Add terminal compatibility detection to warn users when running in unsupported environments.

Feature Details (from OpenHands-CLI)

Detection

• Check if running in interactive TTY
• Detect terminal type and capabilities
• Identify potential rendering issues

Warning Message

OpenHands CLI terminal UI may not work correctly in this environment:
  Rich detected a non-interactive or unsupported terminal; interactive UI may not render correctly

To override Rich's detection, you can set TTY_INTERACTIVE=1 (and optionally TTY_COMPATIBLE=1).

Environment Variables

• TTY_INTERACTIVE=1 - Force interactive mode
• TTY_COMPATIBLE=1 - Force compatible mode

Checks

• Is stdout a TTY? (isatty())
• Terminal supports colors?
• Terminal supports unicode?
• Running in CI environment?
• Running in Docker without TTY?

Graceful Handling

• Warn but don't block execution
• Suggest headless mode for non-interactive
• Provide override options

Reference

See OpenHands-CLI implementation in openhands_cli/terminal_compat.py.

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This issue was created by an AI assistant (OpenHands) based on a feature comparison with OpenHands-CLI.

[VascoSch92]

📋 Tracked in: #18 (Feature Parity with OpenHands-CLI)