Why

codex features list currently prints features in declaration order from codex_core::features::FEATURES. That makes the output harder to scan when looking for a specific flag, and the order can change for reasons unrelated to the CLI.

What changed

• Sort the codex features list rows by feature key before printing them in codex-rs/cli/src/main.rs.
• Add an integration test in codex-rs/cli/tests/features.rs that runs codex features list and asserts the feature-name column is alphabetized.

Verification

• Added features_list_is_sorted_alphabetically_by_feature_name.
• Ran cargo test -p codex-cli.