Add global --test flag to suppress output during unit testing

[dreamer-coding]

Summary

Introduce a global --test flag to suppress or minimize command output during unit testing.

Motivation

Unit tests require predictable and clean output. Current commands may produce verbose or inconsistent output, making testing difficult.

Proposed Solution

Implement a global --test flag that disables standard output, logs only essential data, or redirects output to a controlled format suitable for testing.

Alternatives Considered

Mocking or redirecting output externally, which adds complexity and reduces consistency.

Additional Context

Improves testability and reliability across all commands