fix: preserve page-1 correspondence support in OCR routing

paperforge/worker/ocr_roles.py

@@ -1128,6 +1128,16 @@ def assign_block_role(
                 evidence=[f"author byline on page 1, assigned as authors: {text[:60]}"],
             )
 
+        # Explicit correspondence line → frontmatter_support (must run before generic noise rule)
+        if page_num == 1:
+            lower_txt = text.lower().strip()
+            if lower_txt.startswith(("correspondence", "corresponding author", "address for correspondence")):
+                return RoleAssignment(
+                    role="frontmatter_support",
+                    confidence=0.75,
+                    evidence=[f"page-1 correspondence support: {text[:60]}"],
+                )
+
         if re.search(r"(?:correspondence|orcid|@)", text.lower()) and len(text.split()) <= 20 and page_num == 1:
             return RoleAssignment(
                 role="frontmatter_noise",
@@ -1280,6 +1290,14 @@ def assign_block_role(
         page_num = block.get("page", 1) or 1
         still_frontmatter = _page_still_frontmatter(page_blocks, page_num, page_height)
 
+        # Explicit page-1 correspondence line → frontmatter_support
+        if page_num == 1 and lower_txt.startswith(("correspondence", "corresponding author", "address for correspondence")):
+            return RoleAssignment(
+                role="frontmatter_support",
+                confidence=0.75,
+                evidence=[f"page-1 correspondence support: {text[:60]}"],
+            )
+
         # Check for inline table HTML
         if text.strip().lower().startswith("<table"):
             return RoleAssignment(

tests/test_ocr_real_paper_regressions.py

@@ -1026,3 +1026,15 @@ def test_dwqqk2yb_page1_preproof_frontmatter_is_not_swallowed(tmp_path: Path) ->
 
     assert title_like, "Expected a page-1 paper_title block in DWQQK2YB"
     assert author_like, "Expected a page-1 authors block in DWQQK2YB"
+
+
+def test_caqnw9q2_page1_correspondence_is_not_frontmatter_noise(tmp_path: Path) -> None:
+    result = replay_production_pipeline("CAQNW9Q2", tmp_path)
+    blocks = result["structured_blocks"]
+    candidates = [
+        b for b in blocks
+        if b.get("page") == 1 and "correspondence" in str(b.get("text") or "").lower()
+    ]
+    assert candidates, "Expected a correspondence-related block on CAQNW9Q2 page 1"
+    assert any(b.get("role") == "frontmatter_support" for b in candidates)
+    assert not all(b.get("role") == "frontmatter_noise" for b in candidates)

tests/test_ocr_roles.py

@@ -1494,3 +1494,18 @@ def test_highlights_label_does_not_swallow_following_body_paragraphs() -> None:
     assert roles[0].role == "structured_insert_candidate"
     assert roles[1].role == "body_paragraph"
     assert roles[2].role == "body_paragraph"
+
+
+def test_page1_explicit_correspondence_line_is_frontmatter_support() -> None:
+    from paperforge.worker.ocr_roles import assign_block_role
+
+    block = {
+        "page": 1,
+        "block_label": "text",
+        "block_content": "Correspondence: Prof. Smith, Department of Orthopedics, email@example.org",
+        "block_bbox": [100, 1380, 980, 1450],
+        "page_width": 1200,
+        "page_height": 1600,
+    }
+    result = assign_block_role(block, [block], page_width=1200, page_height=1600)
+    assert result.role == "frontmatter_support"