[WIP] Add unit tests for function in builder.go

[Copilot]

• Explore repository structure and understand the Command function in internal/cmd/builder.go (lines 78-173)
• Review existing test patterns in the repository
• Create unit tests for the Command function covering:
  • Basic command creation with default Use name
  • Command creation with custom Use name
  • String field handling with name, alias, usage, default value
  • Int field handling with default value parsing
  • Bool field handling with true/false defaults
  • Slice field handling with StringSlice (default)
  • Slice field handling with StringArray (split="false")
  • Map field handling
  • Environment variable binding
  • PersistentPreRunnable interface detection
  • PreRunnable interface detection
  • HasHelpFunc interface detection
  • customizer interface detection
  • Embedded struct support
  • Unsupported field type panic
  • Field without tags
  • Non-numeric default for int fields
• Run tests to verify they pass (28 tests pass)
• Run linter to ensure code quality
• Run code review and address feedback
• Run codeql_checker

Original prompt

On builder.go:78-173, Create a new PR creating unit tests for this function.

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