Improve user feedback architecture#113
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Replace bare println!/eprintln!/print! calls across all command modules with a CliWriter trait abstraction. Commands now receive &dyn CliWriter, enabling testable output without filesystem or terminal dependencies. - Add CliWriter trait with semantic methods (line, heading, list_item, indented, detail, blank, message, warn_stderr, raw) - Add StdoutCliWriter for production use (identical output to before) - Add BufferCliWriter (cfg(test)) with typed OutputEntry enum for semantic assertions in unit tests - Wire writer through Commands::execute() into all command modules - Add unit tests for add, manage, and additional_packages output
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println!guidance messages in interactive prompts #97