This pull request introduces a new `test-conn` command-line tool for
testing SSH connection flows and user input handling, along with
improvements to user input provider extensibility and several
configuration and validation enhancements.
* New `test-conn` CLI Tool
* User Input Provider Abstraction
* Refactored user input handling to use a pluggable `UserInputProvider`
interface, with a default `FrontendProvider` and the ability to set a
custom provider
* AI Configuration and Verbosity updates
* Enforced that a `SwapToken` must be present in `CommandOptsType` when
starting a remote shell with wsh, improving validation and error
handling. (`pkg/shellexec/shellexec.go`)
* Improved config directory watcher logic to log the config directory
path and avoid logging errors for non-existent subdirectories
