Move the seed scripts out to the private workspace root

Several of them describe this installation specifically — its broker, its
aircon, its DMX wiring — and this repository is about to be public. The
test and client-generation scripts stay; CI depends on scripts/test.sh.

docs/code/nodes.md

@@ -255,7 +255,8 @@ prepare ──dataset(artifact)──▶ train ──weights(artifact)──▶
                                  └── loss (streaming float) ──▶ chart
 ```
 
-`make seed-demo` builds it against a running stack.
+The example is built by a seed script the maintainers run against a live
+stack; the flow above is what it produces.
 
 ## See also