Idea: an agent skill that self-drives build + verify + fix for gst-nvdsudp / gst-dsexample-cuda

[KhaiTrang1995]

build/build.sh intentionally skips two plugins — gst-nvdsudp (Rivermax/SMPTE
ST2110 UDP transport) and gst-dsexample-cuda (OpenCV-CUDA reference plugin) —
because each needs an external SDK the standard dependency install doesn't
provision (build/BUILD.md "Components with External Prerequisites"). Right now
there's no skill or example prompt covering either one, so anyone using an AI
coding agent with this repo has to walk through both READMEs by hand — Rivermax
SDK setup, an OpenCV-4.10.0-with-CUDA from-source build, Makefile env vars,
gst-inspect-1.0 verification — with no guardrails around the sudo/system-level
steps involved.

I put together an agent-skill package (SKILL.md + reference docs, compatible
with Claude Code / Cursor / Codex-style agent skills) that lets the AI handle
this loop itself instead of the user copy-pasting each command:

• Build → gst-inspect-1.0 verify → on failure, check against a known-error
  table before proposing anything.
• Only two failure modes are auto-retried (a CUDA_VER env var dropped across
  sudo, a stale GStreamer plugin cache) — anything else (missing Rivermax SDK,
  missing OpenCV-CUDA, compiler rejecting the build) stops and asks instead of
  guessing.
• Capped at 3 build attempts, and stops immediately if the same error repeats
  twice in a row instead of "spinning."
• Explicit approval gate before the first sudo command and before starting any
  long-running external SDK install — nothing runs against the live system
  unattended.
• Flags upfront that installing gst-dsexample-cuda overwrites the CPU
  dsexample build already on the system.

I know this repo isn't taking code contributions right now, so I'm not opening a
PR — just sharing the idea in case it's useful input for the official skills/
set, or for whoever eventually documents onboarding for these two plugins.

Code for reference: https://github.com/KhaiTrang1995/DeepStream/tree/feat/add-deepstream-kits/skills/deepstream-build-external-plugins