DOCA Arg Parser

Where to start: This skill assumes DOCA is already installed and the user is doing hands-on CLI work on a DOCA sample or new DOCA-using app. Open TASKS.md if the user wants to do something (configure / build / modify / run / test / debug); open CAPABILITIES.md when the question is what can the Arg Parser express on this version. If the user has not installed DOCA yet, route to doca-setup first. If the user is about to rewrite a sample's CLI with getopt / argparse / custom parsing instead of reusing the Arg Parser, read the load-bearing rule in CAPABILITIES.md ## Capabilities and modes before any code change.

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