refactor: improve testability and reduce complexity

[idebeijer]

This pull request introduces a comprehensive refactoring to improve testability and reduce complexity across the codebase by implementing the options pattern for multiple commands. The changes enable better unit testing through dependency injection while maintaining backward compatibility.

Changes:

• Implements options pattern (Complete/Validate/Run) for exec, kubectl, context, and namespace commands with injectable dependencies for improved testability
• Adds comprehensive test suites covering various scenarios including error handling, interactive/non-interactive modes, and edge cases
• Refactors protection info and kubeconfig lint code into smaller, more focused functions for better readability and maintainability

[Copilot]

Pull request overview

This pull request introduces a comprehensive refactoring to improve testability and reduce complexity across the codebase by implementing the options pattern for multiple commands. The changes enable better unit testing through dependency injection while maintaining backward compatibility.

Changes:

• Implements options pattern (Complete/Validate/Run) for exec, kubectl, context, and namespace commands with injectable dependencies for improved testability
• Adds comprehensive test suites covering various scenarios including error handling, interactive/non-interactive modes, and edge cases
• Refactors protection info and kubeconfig lint code into smaller, more focused functions for better readability and maintainability

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/fzf/fzf.go	Renamed IsInteractiveShell to IsInteractive for consistency
internal/fzf/fzf_test.go	Added tests for argument parsing and fzf argument building logic
internal/config/config_test.go	Added tests for default configuration and YAML generation
cmd/context.go	Refactored to use options pattern with injectable dependencies
cmd/context_test.go	Added comprehensive tests for context command with helper function
cmd/namespace.go	Refactored to use options pattern with injectable dependencies
cmd/namespace_test.go	Added comprehensive tests for namespace command
cmd/kubectl.go	Refactored to use options pattern with injectable dependencies
cmd/kubectl_test.go	Added comprehensive tests for kubectl command
cmd/exec.go	Refactored to use options pattern with injectable dependencies
cmd/exec_test.go	Added comprehensive tests for exec command
cmd/protection/info.go	Extracted helper functions for better code organization
cmd/kubeconfig/lint.go	Extracted validation functions for improved readability
Makefile	Added test-cover target for coverage analysis
.golangci.yml	Added errcheck exclusions for fmt functions

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