add dora_ulite6 standalone node with command lifecycle status

Migrates the ulite6 Python dora node from dora_littlehand into a
self-contained repository following the dora-zed structure. Adds
command lifecycle state ("started"/"done"/"failed") and type
("command"/"error") to the status output so coordinator nodes can
reliably sequence robot actions without polling.

.gitignore

@@ -0,0 +1,13 @@
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+dist/
+build/
+*.egg
+.env
+.venv
+.pytest_cache/
+.coverage
+.ruff_cache/
+out/