History persistence from file #72
Open
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Added
• ReadLine.LoadHistory(string filePath)
Loads history from a plain text file, one command per line.
• ReadLine.SaveHistory(string filePath)
Saves the current in-memory history to the specified file.
Improvements
• History entries are only added if HistoryEnabled is true
• Duplicate or empty entries are not added consecutively
• Tests added to validate load/save functionality