- Remove @tdd_expected_fail from Tree with json format scenario in
plan_explain.feature (bug is now fixed by the envelope implementation)
- Update scenario assertions to verify new spec-required envelope format
instead of old bare-array format
- Add step_tree_json_valid_envelope step definition in plan_explain_steps.py
- Fix ruff format violation in plan_explain_cli_coverage_steps.py
ISSUES CLOSED: #9163