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main() prints Failure::Error raw again, so the CLI's own multi-line messages (usage after "missing argument" / "unknown command") keep their line breaks. A new engine_error helper escapes control, bidi and invisible characters in text that comes from the engine or a file, and every such conversion goes through it. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FypgCX8G9hbs6XYZFsgjbL