- RAW: Mahler/Pine/Stone 1975 vs Stone/Church 1968 (2 separate books), Grossmann×2/Waters
joined; xref.py AUTHOR_LINE now supports up to 4 author groups + continuation-year lines
- xref map: 51 raw entries → 46 unique books (5 B-list duplicates merged); 5 xrefs
(CW8→sec01#03, CW9/I→sec01#04, CW17→sec02#09, Wilkinson→sec01#55, Children's Dreams→sec02#11)
- largest section so far (46 vs 28 sec06)