Add output field (io.Writer) to Manager and Engineer structs with
SetOutput() methods to enable testability and output redirection.
Replace all 30+ fmt.Printf/Println calls with fmt.Fprintf/Fprintln
using the configurable output writer, defaulting to os.Stdout.
This enables:
- Testing output without capturing stdout
- Redirecting output in different contexts
- Following cobra best practices
Closes: gt-cvfg
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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