feat(ask): add text wrapping for wide table columns

- Implement wrap_text function to handle long cell content
- Auto-wrap table columns when content exceeds available width
- Preserve original table rendering for fits-all cases
- Remove sample_datasets project (no longer needed)
- Update .gitignore to use wildcard for target dirs

.gitignore

@@ -5,8 +5,4 @@ done_tables.txt
 done_transfers.txt
 # CocoIndex Code (ccc)
 /.cocoindex_code/
-# Generated schema artifacts (run schema_compiler.py to regenerate)
-context/schema_ddl.sql
-context/schema_compact.txt
-context/schema_compact_inline.txt
-context/join_graph.json
+**/target