Empty results for search with large (+100) include_domains/exclude_domains lists
## Context
Search with large (+100) include_domains/exclude_domains lists returns empty results; shrinking the list brings results back. No documented limit found.
## Verified resolution
Collaborator maitarasher: Tavily imposes no hard limit, but very long domain lists can lead to suboptimal or empty results - keep the lists as short as possible. For exclude_domains, a 150-domain deny list can also simply leave no relevant results for the query. Lesson: prefer short, targeted domain lists.