feat: inline xflag package and improve ParseToEnd#7
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This PR inlines the
github.com/mfridman/xflagdependency into the repository as thexflag/sub-package, removing the external module dependency. While doing so, two improvements were made toParseToEnd:reflect+unsafehack used to set theFlagSet's internalargsfield was replaced withf.Parse(append([]string{"--"}, args...)), which achieves the same result by leveraging the standard library's--terminator behavior.--delimiter is now stripped from positional args, consistent with the standard library's behavior.Test coverage was expanded from 8 to 15 cases (100% statement coverage), including interleaved space-separated flags, single-dash syntax, standalone
-, duplicate flags, and the--terminator edge cases.