Write a Python utility: deduplicate lines in a file

Create a simple Python script that reads a text file, removes duplicate lines while preserving order, and writes the result to an output file. Include a CLI interface (argparse) and basic error handling.

Requirements

Acceptance Criteria

[
  "Python script that reads input file and writes deduplicated output",
  "Preserves original line order (first occurrence kept)",
  "CLI interface with --input and --output arguments",
  "Handles file-not-found and permission errors gracefully",
  "Includes at least 3 unit tests"
]

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