fix(iserv): no repeated text from merged DOCX cells

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

iserv-filter/taskfilter.py

@@ -42,7 +42,12 @@ def _docx(data):
     from docx import Document
 
     doc = Document(io.BytesIO(data))
-    return "\n".join([p.text for p in doc.paragraphs] + [c.text for t in doc.tables for r in t.rows for c in r.cells])
+    cells = {}  # a merged cell is returned once per grid column it spans: take each one only once
+    for t in doc.tables:
+        for r in t.rows:
+            for c in r.cells:
+                cells.setdefault(c._tc, c.text)
+    return "\n".join([p.text for p in doc.paragraphs] + list(cells.values()))
 
 
 def _html(data):