fix(notion-search): make API errors non-fatal in search_candidates

Code review caught that without exception handling around
notion.search() and notion.data_sources.query(), any transient API
hiccup (rate limit, 5xx, network blip) would crash the whole search
and lose candidates already accumulated from earlier variants/DBs.

Wrap both calls in try/except, mirror the resolver's pattern: stderr
warning + continue. Same query against another variant or another DB
still has a chance to succeed.

Also tightened response.get("results", []) → response.get("results")
or [] so a hypothetical {"results": null} response doesn't crash the
inner loop.

17/17 tests still pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom-skills/31-notion-organizer/code/scripts/notion_search.py

@@ -114,8 +114,13 @@ def search_candidates(
                 if prop_filter:
                     params["filter"] = prop_filter
 
-                response = notion.data_sources.query(**params)
-                for page in response.get("results", []):
+                try:
+                    response = notion.data_sources.query(**params)
+                except Exception as exc:
+                    print(f"Warning: query failed for database {db_id}: {exc}",
+                          file=sys.stderr)
+                    continue
+                for page in response.get("results") or []:
                     page_id = page.get("id")
                     if page_id and page_id not in seen_ids:
                         seen_ids.add(page_id)
@@ -124,8 +129,13 @@ def search_candidates(
                             return candidates
         else:
             # Workspace-wide search
-            response = notion.search(query=query, page_size=100)
-            for item in response.get("results", []):
+            try:
+                response = notion.search(query=query, page_size=100)
+            except Exception as exc:
+                print(f"Warning: workspace search failed for variant {query!r}: {exc}",
+                      file=sys.stderr)
+                continue
+            for item in response.get("results") or []:
                 if item.get("object") != "page":
                     continue
                 page_id = item.get("id")