docs: Add comprehensive Go documentation for REPL functions

- Enhanced NewREPL documentation with detailed parameter descriptions
- Enhanced RunREPL documentation clarifying it's a convenience wrapper
- Improved executor documentation explaining backward compatibility and testing usage
- Enhanced defaultExecutor documentation with input processing details and panic recovery
- Enhanced defaultCompleter documentation with tab-completion behavior details
- Enhanced defaultGetCommandDescription documentation with command description details
- Improved TTYChecker methods (IsTTY, EnsureTTY) documentation
- Improved SignalHandler.Start method documentation

All exported and non-exported functions in the REPL package now have comprehensive documentation comments that describe their purpose, parameters, and return values.

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