Adds a depth panel tiled beside the image, the camera_info input holding the
pinhole model, and std/media/v1/Image as the payload for both image and depth.
Builds with uv, lints markdown, keeps the workflow where act looks for it, and
carries a worked example wiring dora-webcam in.
The node was named opencv-plot everywhere, and the example dataflow could not
run without a webcam and two nodes fetched over the network.
Renames the node to dora-image-view, replaces the external example with a
synthetic source in this checkout, types that source inline rather than
shipping a second manifest, and merges the two CI jobs into one.
cristhian