[BUG] LexC Document Type Classification Failure - Clear Document Headers Not Recognized

Bug Description

LexC fails to identify document types even when explicitly stated in document headers.

Reproduction

Process document with clear header "CONSULTING AGREEMENT"

Expected: document_type: "contract" or "consulting_agreement"
Actual: document_type: "unknown"

Impact

• Document classification pipeline broken
• Semantic analysis starts with wrong document type
• Legal analysis may miss document-specific rules

Test Case

Document: SchromM_Services Agreement_20190829.docx
Header: "CONSULTING AGREEMENT" (all caps, clearly visible)
Result: Type marked as "unknown"

Priority: High - Core document classification functionality