svc-vision: camera live view, moved from app-flutter's test tool

Camera-agnostic (--camera auto finds any V4L2 capture device and finds it
again after a replug; non-MJPEG cameras are encoded), says when the camera
is unavailable, paced per decision 28. Python, standard library only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

README.md

@@ -0,0 +1,28 @@
+---
+type: reference
+---
+# Vision
+
+Part of **Project Yukart**, making an old 2008 Mitsubishi Z27AG a bit smarter with modern technologies.  
+This file serves as the minimalist portal to other docs
+
+
+## What this repo is about
+
+Runs on the Orin. Owns the camera: capture, the live view to the tablet, and
+later recording and inference. Camera-agnostic: any V4L2 capture device, in
+practice a USB (UVC) webcam.
+
+| Program | Installed as | Does |
+|---|---|---|
+| `src/liveview.py` | `yukart-vision.service` | Camera frames to display clients on `:7710`, paced to the link |
+
+```bash
+python3 src/liveview.py --camera auto          # anywhere with a camera, GStreamer and v4l-utils
+scripts/deploy.sh                              # install yukart-vision on the car Orin
+```
+
+The client is `app-flutter`'s live view (`lib/camview.dart`).
+
+- For implementation practice guidelines, refer to the [guidelines](docs/GUIDELINES.md);  
+- For implementation plans and history, refer to [them](docs/impl/);