Resolve enterprise shortname = zb (closes corrections-doc D4) and propagate through all UNS path examples and schema seeds.

Updated goal-state.md UNS hierarchy table (level 1 example with rationale: matches existing ZB.MOM.WW.* namespace prefix, short by design for a segment that appears in every equipment path, operators already say "ZB" colloquially), all worked-example paths in text + OPC UA browse forms, small-site placeholder example. Removed enterprise-shortname from the §UNS-hierarchy TBD list.

Updated schemas/uns/example-warsaw-west.json `enterprise: "zb"`.

Updated corrections-doc D4 entry to RESOLVED with full propagation list, and updated summary table accordingly.

Production deployments use `zb` from cluster-create. The hardcoded `_default` reserved-segment rule is unchanged (still the placeholder for unused Area/Line levels at single-cluster sites).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

schemas/uns/example-warsaw-west.json

@@ -1,6 +1,6 @@
 {
   "$schema": "../format/uns-subtree.schema.json",
-  "enterprise": "ent",
+  "enterprise": "zb",
   "site": "warsaw-west",
   "displayName": "Warsaw West (example)",
   "areas": [