* [IMPROVEMENT] `SelectedFieldNames` now returns dot-delimited nested field paths (e.g. `products`, `products.id`, `products.category`, `products.category.id`). Intermediate container object/list paths are included so resolvers can check for both a branch (`products.category`) and its leaves (`products.category.id`). `HasSelectedField` and `SortedSelectedFieldNames` operate on these paths. This aligns behavior with typical resolver projection needs and fixes missing nested selections.
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