Synthesizes a 640x360 cyan BGRA source named like a Teams participant, runs the production IsoPipeline against it (NdiReceiver -> FrameProcessor -> ManagedNearestNeighborFrameScaler -> NdiSender, all backed by NdiInteropPInvoke), connects a receiver to the resulting TEAMSISO_* output, and asserts that captured frames come back at the configured 1920x1080 target. Closes the loop on the receive/scale/emit chain that was previously only unit-tested in isolation against fakes.
If this test ever goes red we have a regression in something that actually matters: the runtime resolver, the parser-free pipeline construction path, the frame channel back-pressure, the scaler's pillarbox math, the sender clock, or the receiver-from-loopback path. Pinned at requires=ndi so default CI skips it; runs locally in ~780ms.
