UX: implement visual product roadmap

backend/app/services/knowledge/__init__.py

@@ -33,7 +33,9 @@ class KnowledgeHealth(BaseModel):
     tenant: str
     workspace: str
     collection: str
-    document_count: int
+    # A provider may be healthy without exposing a corpus-size endpoint. `None` means
+    # unknown, never "zero procedures".
+    document_count: int | None
 
 
 class KnowledgeProvider(Protocol):

backend/app/services/knowledge/ragcore.py

@@ -86,9 +86,9 @@ class RAGcoreKnowledgeProvider:
             tenant=self._settings.ragcore_tenant,
             workspace=self._settings.ragcore_workspace,
             collection=self._settings.ragcore_collection,
-            # RAGcore's retrieval API has no corpus-size endpoint to query honestly from
-            # here; left at 0 rather than approximated from a capped search result count.
-            document_count=0,
+            # RAGcore's retrieval API has no corpus-size endpoint. Unknown is explicit
+            # so the UI never turns this into the misleading claim "0 procedures".
+            document_count=None,
         )
 
     def ask(self, question: str, correlation_id: str, language: str = "en-GB") -> GroundedAnswer: