feat(hp): promote HP client + add hp_copy_review profile

HP is no longer a placeholder. The client gets a new hp_copy_review
profile (single weighted check, client-specific visibility) as its
default, plus the generic static_general and video_general profiles
it already had visibility into.

backend/client_config.py

@@ -63,9 +63,10 @@ CLIENT_PROFILES = {
     },
     'hp': {
         'name': 'HP',
-        'profiles': ['static_general', 'video_general'],
+        'profiles': ['hp_copy_review', 'static_general', 'video_general'],
         'display_name': 'HP',
-        'description': 'Demo client — scope pending'
+        'description': 'HP marketing copy QC graded against canonical Source Messaging',
+        'default_profile': 'hp_copy_review',
     },
     'ferrero': {
         'name': 'Ferrero',

backend/profiles/hp_copy_review.json

@@ -0,0 +1,14 @@
+{
+  "name": "HP Copy Review",
+  "description": "Marketing copy graded against canonical HP Source Messaging",
+  "mode": "asset",
+  "visibility": "client_specific",
+  "visible_to_clients": ["hp"],
+  "checks": {
+    "hp_copy_review": {
+      "weight": 10.0,
+      "llm": "gemini",
+      "enabled": true
+    }
+  }
+}