DOCA RDMA Initiator

Where to start: This skill assumes DOCA is already installed and the user is doing hands-on RDMI work on a host or BlueField with the DOCA package set that ships the doca-rdmi library. Open TASKS.md if the user wants to do something (install / configure / build / modify / run / test / debug / use); open CAPABILITIES.md when the question is what can RDMI express on this version — the object model, the DPA-side handle types, the relationship to doca-rdma, the EXPERIMENTAL-tag policy, and the safety overlay.