fix: skip terminal compatibility check in headless mode

[rbren]

Summary

When running in headless mode, the CLI was displaying a confusing warning about Rich detecting a non-interactive terminal:

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).

This warning is unnecessary in headless mode since there's no interactive UI to render anyway.

Changes

• Modified openhands_cli/entrypoint.py to wrap the terminal compatibility check in a if not args.headless: condition
• The check is now only performed when running in interactive (non-headless) mode

Verification

• ✅ make lint passes
• ✅ tests/test_terminal_compat.py tests pass

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🚀 Try this PR

uvx --python 3.12 git+https://github.com/OpenHands/OpenHands-CLI.git@fix/skip-terminal-check-in-headless-mode

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
openhands_cli
entrypoint.py	124	45	63%	32, 52–53, 56, 59, 61–62, 64–65, 68, 70, 72, 76, 81, 83–84, 133, 135–136, 139–143, 146–147, 149, 151, 161, 163–165, 167, 169–171, 174, 176, 180, 189, 191–193, 213, 260
TOTAL	6640	919	86%