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## Summary - Align **GET `/api/v1/documents/<doc_id>/download`** with **`/preview`**: resolve extension and MIME type from the stored document name when the **`ext` query parameter is omitted**, instead of defaulting to `markdown`. - When **`?ext=`** is present, behavior stays the same as before (explicit extension / `Content-Type` mapping). - Enforce the same access + document lookup pattern as preview (**`accessible`** + **`get_by_id`**). - Extend unit tests for the no-`ext` PDF filename case. ## Test plan - [x] `uv run pytest test/testcases/test_web_api/test_document_app/test_document_metadata.py::TestDocumentMetadataUnit::test_download_attachment_success_and_exception_unit` - [x] Optional: `curl -sSI` against `/api/v1/documents/<pdf_doc_id>/download` without `ext` and confirm `Content-Type: application/pdf` Fixes #15052.