feat: add hello command#27
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Adds a simple 'af hello' subcommand that prints "hello world" to stdout. Includes a unit test verifying the output.
Review finding: SetOut on package-level command should be reset after test to prevent state leakage between tests.
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Summary
af hellosubcommand that prints "hello world" to stdoutFollows existing Cobra command patterns in
cmd/af/cmd/.