fix(loader): keep empty folderPath distinct in vtag ids; dedupe verify args; readme wait-seconds

otopcua-uns-loader/README.md

@@ -132,7 +132,7 @@ deploy** endpoint.
 ```bash
 ./.venv/bin/python otopcua_uns.py populate-equipment        # 3 areas / 8 lines / 40 equipment / 1036 VirtualTags
 curl -s -X POST http://localhost:9200/api/deployments -H 'X-Api-Key: docker-dev-deploy-key'   # headless deploy
-./.venv/bin/python otopcua_uns.py verify-equipment --expect 1036 --require-good 1036 --wait   # structure + live values
+./.venv/bin/python otopcua_uns.py verify-equipment --expect 1036 --require-good 1036 --wait --wait-seconds 300   # structure + live values
 ```
 
 UNS folders carry the friendly **DisplayName** (`filling`); the BrowseName/NodeId

otopcua-uns-loader/otopcua_uns.py

@@ -294,7 +294,7 @@ def cmd_populate_equipment(args):
         eq_n += 1
         for t in e["tags"]:
             dtype = _DTYPE_FIX.get(t["dataType"], t["dataType"])
-            folder = t.get("folderPath") or None
+            folder = t.get("folderPath")
             # The galaxy-mirror MXAccess ref (e.g. TestMachine_001.TestDouble) is the upstream
             # the VirtualTag mirrors. DependencyExtractor harvests the literal in ctx.GetTag(),
             # so the engine subscribes to exactly this path on the galaxy-mirror driver.