Add custom help output for pflag#9
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Replace the default pflag help text with a cleaner custom usage screen. Group flags by mode, options, and misc commands, and add examples to make the CLI easier to understand.
Build the custom help text in memory and write it once so output errors are handled cleanly and golangci-lint errcheck passes without suppressing returned errors on every fmt.Fprintf call.
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Replace the default pflag help text with a cleaner custom usage screen. Group flags by mode, options, and misc commands, and add examples to make the CLI easier to understand.