fix: parse yolo status env consistently

[denisqq]

Summary

• Parse HERMES_YOLO_MODE in the CLI status bar with is_truthy_value(...) instead of raw string truthiness.
• Add regression coverage for false-like and truthy YOLO env values in both status-bar text and prompt-toolkit fragments.

Closes #33605

Test Plan

• python -m pytest tests/cli/test_cli_status_bar.py tests/test_utils_truthy_values.py tests/tools/test_yolo_mode.py::TestYoloMode::test_false_like_yolo_values_do_not_bypass_dangerous_command -q -o 'addopts='

[alt-glitch]

Competing fix with #33614 for #33605 — both replace bool(os.getenv("HERMES_YOLO_MODE")) with is_truthy_value(...) in _build_status_bar_text and _get_status_bar_fragments. Tests in different files (test_cli_status_bar.py vs test_cli_background_status_indicator.py). Recommend consolidating into a single PR.

[denisqq]

Closing because this PR targeted the wrong issue. Replaced by #33620 for the actual /goal compression-session migration bug.