DOCA SPCX Congestion-Control Tool

Where to start: This is a tool skill for invoking doca_spcx_cc — the documented host-side CLI that exercises an SPCX-class Programmable Congestion Control algorithm on a live RDMA / RoCE fabric driven by a BlueField with a DPA processor. Open TASKS.md and start at ## configure for the SPCX-vs-PCC-vs-factory-firmware decision tree (load-bearing gate before any code), the role decision (RP / NP), the DPA-side algorithm authoring vs consumption split, and the live-link / contention precondition. Open CAPABILITIES.md when the question is what does SPCX let me express that doca-pcc does not, what is the SPCX-vs-PCC tradeoff, what runtime metrics does the tool surface, or what is the safety posture for loading a custom CC algorithm on a production fabric. If DOCA is not installed yet, route to doca-setup first.