Command Line Argument Parsing

## Background
For Version 0.1.0 InDev of Tessitura, we need to implement robust command line argument parsing to allow users to specify directory paths and various optional configuration flags. This will provide a flexible interface for users to interact with the directory mapping functionality.

## Description
Design and implement a command line interface that processes user input arguments, validates them, and configures the application accordingly. The CLI should support specifying target directory paths and various optional flags to control the behavior of the directory mapping process.

## Requirements
- Implement parsing for the following arguments:
- Directory path (required, with support for default to current directory)
- Depth limit for recursive traversal (optional)
- Filter options (by file extension, name patterns, etc.)
- Output format options
- Verbosity level
- Help and version information
- Validate user input and provide clear error messages for invalid arguments
- Support both short (-h) and long (--help) flag formats
- Implement subcommands for different operations (if applicable)
- Provide contextual help for each command and option
- Support combining multiple flags

## Technical Notes
- Consider using the `clap` crate for robust argument parsing
- Follow CLI best practices (GNU or POSIX style)
- Implement proper validation of path arguments
- Consider environment variable fallbacks for common options
- Structure the code to separate argument definition from processing logic
- Ensure help text is comprehensive and formatted consistently
- Handle edge cases like conflicting flags or invalid combinations

## Acceptance Criteria
- Application correctly parses directory path arguments
- All specified optional flags are properly processed
- Invalid inputs result in clear, actionable error messages
- Help documentation is available and comprehensive
- Arguments properly influence the application behavior
- Different argument combinations work as expected
- Unit tests verify correct parsing of various argument combinations
- Documentation includes examples of common usage patterns

## Estimated Effort
Medium (2-3 days)