fix: SearchService.search() calls comprehensive_web_search incorrectly (broken public API) (#1720)

SearchService.search() did:

    raw_results = await comprehensive_web_search(
        query, max_results=10 * depth, fetch_content=fetch_content)

comprehensive_web_search is a synchronous function whose count knob is
`max_pages` (not `max_results`) and which has no `fetch_content` parameter, so
the call raised TypeError on argument binding; `await` on its non-coroutine
return would also fail. It returns a context string, or a (context, sources)
tuple with return_sources=True — not the list of dicts the wrapper iterates.

The method is exported in services/search/__init__.py and services/__init__.py
with a usage example in its docstring, so any caller of the documented public
API hit an immediate crash. Call it correctly via asyncio.to_thread with
max_pages + return_sources=True and use the returned source list as the rows.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

services/search/service.py

@@ -62,13 +62,18 @@ class SearchService:
             SearchResponse with results
         """
         depth = depth or self.default_depth
-        fetch_content = fetch_content if fetch_content is not None else self.fetch_content
 
-        # Use existing search implementation
-        raw_results = await comprehensive_web_search(
+        # comprehensive_web_search is synchronous and, with return_sources=True,
+        # returns (context_str, [{"url", "title"}, ...]). Run it off the event
+        # loop so we don't block it, and use the source list as the result rows.
+        # `fetch_content` is accepted for API compatibility; the comprehensive
+        # search always fetches page content.
+        import asyncio
+        _context, raw_results = await asyncio.to_thread(
+            comprehensive_web_search,
             query,
-            max_results=10 * depth,
-            fetch_content=fetch_content,
+            max_pages=10 * depth,
+            return_sources=True,
         )
 
         results = []