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-Idempotent Banner Injection: Checks if the file already has a banner (/*! or /**) to prevent duplicates.
-Async / Non-blocking I/O: Uses fs.promises for modern, asynchronous file operations.
-Atomic Write: Writes to a temporary file first, then renames it to avoid corruption or partial writes.
-Preserves File Metadata: Attempts to retain original file permissions and timestamps.
-Robust Path Handling: Supports optional file argument and resolves package.json reliably.
-Better Error Handling: Exits with a non-zero code if an error occurs, making it CI-friendly.
-Future-proof / Maintainable: Clean, readable, and structured for easy updates or integration into npm scripts or CI pipelines.