feat: add vsm hub metadata

Application/Schema.sql

@@ -25,7 +25,19 @@ CREATE TABLE hubs (
     domain TEXT NOT NULL,
     created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
     api_key TEXT,
-    hub_kind TEXT NOT NULL DEFAULT 'domain'
+    hub_kind TEXT NOT NULL DEFAULT 'domain',
+    hub_family TEXT,
+    vsm_function TEXT,
+    vsm_system TEXT,
+    CONSTRAINT hubs_vsm_metadata_consistency CHECK (
+        (hub_family IS NULL AND vsm_function IS NULL AND vsm_system IS NULL)
+        OR (
+            hub_family = 'vsm'
+            AND vsm_function IS NOT NULL
+            AND vsm_function <> ''
+            AND vsm_system IN ('1', '2', '3', '3*', '4', '5', 'environment')
+        )
+    )
 );
 
 -- Widgets — smallest semantically governable interaction units
@@ -557,6 +569,11 @@ CREATE INDEX hubs_hub_kind_idx ON hubs (hub_kind);
 CREATE UNIQUE INDEX hubs_one_framework_idx ON hubs (hub_kind)
     WHERE hub_kind = 'framework';
 
+-- IHUB-WP-0019 T03 — first-class VSM hub metadata
+CREATE INDEX hubs_hub_family_idx ON hubs (hub_family);
+CREATE INDEX hubs_vsm_system_idx ON hubs (vsm_system)
+    WHERE vsm_system IS NOT NULL;
+
 -- T03 — Type registries
 
 CREATE TABLE widget_type_registry (