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* fix(parse): import email.message and repair pdfplumber test mock - email_parser.py uses email.message.Message at class-definition time but only did 'import email', so 'import semantica.parse' fails in a fresh Python process unless something else imported email.message first - test_pdf_parser patched semantica.parse.pdf_parser.pdfplumber, which never exists as a module attribute (pdfplumber is imported inside PDFParser.parse); inject a fake module via sys.modules instead * fix(parse): warn when PDF parse yields no text layer (scanned PDFs) Scanned (image-only) PDFs parsed via the default pdfplumber route returned an empty full_text with progress status 'completed' - no error, no warning - so the failure only surfaced far downstream. Warn in PDFParser.parse() when every parsed page yields no text (and extract_text is enabled), pointing users to method='docling' with enable_ocr=True. * fix(parse): improve scanned PDF detection --------- Co-authored-by: shanyu910 <208111055+shanyu910@users.noreply.github.com> Co-authored-by: Sameer Kadam <sskadam6305@gmail.com>