fix(cli): Add missing if __name__ == '__main__' block and return non-zero exit code on invalid path

[CodeMaverick-143]

Problem Description

1. In insight/cli.py, def main() is defined, but there is no if __name__ == "__main__": main() block. If a user runs python -m insight.cli or executes python path/to/insight/cli.py, the script exits silently without executing main().
2. When the specified target path does not exist, cli.py prints an error message but executes return, which exits with returncode 0. This causes automated scripts and CI pipelines to interpret the failed run as a success.

Affected Files

• insight/cli.py:26-38

Proposed Solution

1. Add if __name__ == "__main__": main() at the end of insight/cli.py.
2. Replace return with sys.exit(1) when not os.path.exists(args.path).

[YuvrajShekhar]

Fixed the main function calling and also added classes and created objects to call the functions for much cleaner and OOP approach
PR : #36