Add tests for command package#140

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aiopt-phase1-command

Commits on Jun 17, 2025

Step 1.3: Factory Testing with Environment Variable Mocking
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Commits on Jun 19, 2025

Step 2.1: Implement TerraformCommand Run() method testing with dependency injection
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Commits on Jun 21, 2025

Step 2.2: Complete Run() method testing for all command types
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Step 2.3: Remove low-value Help/Synopsis tests and clean up test files
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Commits on Jun 22, 2025

Update documentation and phase progress tracking
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