fix: normalize path prefix in wiki search so tenant filtering matches

get_wikijs_namespace() returns '/users/{user}' with a leading slash while
Wiki.js search results carry paths without one, so the prefix filter in
search_pages rejected every result - wiki search returned empty for every
tenant. Found by cross-repo integration verification; the librarian now
gets real search results. Compare slash-normalized on both sides.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_wikijs_pagination.py

@@ -9,6 +9,7 @@ These tests mock the GraphQL layer.
 """
 
 import pytest
+from unittest.mock import AsyncMock
 
 from src.clients.wikijs_client import WikiJSClient
 
@@ -125,3 +126,22 @@ class TestListPagesLimitAfterFilter:
         pages = await client.list_pages(limit=10)
 
         assert pages[0]["tags"] == []
+
+
+class TestSearchPagesPrefixNormalization:
+    """search_pages must match Wiki.js paths (no leading slash) against
+    get_wikijs_namespace prefixes (leading slash)."""
+
+    @pytest.mark.asyncio
+    async def test_slashed_prefix_matches_unslashed_paths(self):
+        client = WikiJSClient("http://wiki.test", "k")
+        client._execute_query = AsyncMock(return_value={
+            "pages": {"search": {"results": [
+                {"id": "399", "path": "users/llm_tester/docker-guide",
+                 "title": "Docker Guide", "description": ""},
+                {"id": "1", "path": "users/jpmschweitzer/other",
+                 "title": "Other", "description": ""},
+            ]}}
+        })
+        results = await client.search_pages("docker", path_prefix="/users/llm_tester")
+        assert [r["id"] for r in results] == ["399"]