feat(om): OpenMetadata integration — registry node, link, PII tag source

Add OpenMetadata node (atc-docker02 .47) to node_registry with UI links.
pii_catalog now reads OM column PII tags (Presidio auto-classification) as the
authoritative source, merged with the name heuristic; OPENMETADATA_URL wired
into the api service (token via atc.env).

api/node_registry.py

@@ -6,7 +6,7 @@ from typing import Any
 
 NODE_IDS = [
     "airflow", "db", "debezium", "kafka", "lakehouse", "s3",
-    "docker", "hadoop", "gpu", "command",
+    "docker", "hadoop", "gpu", "command", "openmetadata",
     "mo-commander", "bart-commander", "network-watcher", "mcp-coordinator",
 ]
 
@@ -21,6 +21,7 @@ NODE_AGENT = {
     "hadoop": "hadoop-ranger",
     "gpu": "infra-sentinel",
     "command": "infra-sentinel",
+    "openmetadata": "lakehouse-ops",
 }
 
 NODE_REGISTRY: dict[str, dict[str, Any]] = {
@@ -200,6 +201,26 @@ NODE_REGISTRY: dict[str, dict[str, Any]] = {
         ],
         "commands": ["gpu metrics", "model status", "vram usage"],
     },
+    "openmetadata": {
+        "label": "OpenMetadata",
+        "vm": "atc-docker02",
+        "vmid": 0,
+        "pve": "pve01",
+        "ip": "10.0.21.47",
+        "ssh": "ssh root@10.0.21.47",
+        "role": "governance",
+        "color": "#7147e8",
+        "description": "OpenMetadata 1.13 data catalog & lineage. Ingests PostgreSQL, MySQL, MongoDB and Trino; auto-classifies PII (Presidio NER). Single pane for catalog, lineage and governance across the lab.",
+        "links": [
+            {"label": "OpenMetadata UI", "url": "http://10.0.21.47:8585"},
+            {"label": "Ingestion Airflow", "url": "http://10.0.21.47:8080"},
+        ],
+        "endpoints": [
+            {"name": "openmetadata", "host": "10.0.21.47", "port": "8585", "proto": "http"},
+            {"name": "ingestion", "host": "10.0.21.47", "port": "8080", "proto": "http"},
+        ],
+        "commands": ["catalog status", "run ingestion", "pii classification"],
+    },
     "command": {
         "label": "Command Center",
         "vm": "MCP · VM304",