feat(tables): infer columns from horizontal-rule text anchors (#171)

* feat(tables): infer columns from horizontal-rule text anchors

* fix(tables): scope sparse-rule vertical evidence

* fix(tables): validate sparse-rule evidence by content

* fix(tables): preserve independent line-table regions

* fix(tables): isolate sparse-rule regions

src/lib.rs

@@ -1174,7 +1174,7 @@ pub fn detect_vector_grid_in_region_mem(
     }
 
     let line_tables =
-        tables::detect_tables_from_lines(&items_in_region, &lines_in_region, page_1idx);
+        tables::detect_vector_grid_tables_from_lines(&items_in_region, &lines_in_region, page_1idx);
     for table in line_tables {
         if let Some(result) = vector_grid_result_from_table(
             &table,

src/tables/mod.rs

@@ -14,6 +14,7 @@ pub mod structured;
 pub use detect_heuristic::detect_tables;
 pub(crate) use detect_heuristic::is_table_of_contents;
 pub use detect_lines::detect_tables_from_lines;
+pub(crate) use detect_lines::detect_vector_grid_tables_from_lines;
 pub(crate) use detect_rects::cluster_rects;
 pub use detect_rects::{detect_chart_regions, detect_tables_from_rects, RectHintRegion};
 pub use detect_struct::detect_tables_from_struct_tree;