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The cxxopts library currently uses exception class names that end with exception (e.g., option has no value…

The cxxopts library currently uses exception class names that end with exception (e.g., option has no value…: a task in LegoFlow-SWE (Harbor dataset). Other exception types (e.g., for "option already exists", "option required but not present", "option not present") should also be migrated to the…

The task

Other exception types (e.g., for "option already exists", "option required but not present", "option not present") should also be migrated to the `cxxopts::exceptions` namespace with appropriate names that follow the same pattern (no `_exception` suffix), but their exact new names are not mandated by this issue.

Part of Lego-X/LegoFlow-SWE.