Three fixes to PDF chapter extraction quality:
1. Page ordering: parse page number from pdfcpu filename (out_Content_page_N.txt)
instead of using lexicographic sort index — fixes chapters bleeding into each
other (e.g. Prologue text appearing inside Chapter 1).
2. Windows-1252 chars: map bytes 0x91-0x9F to proper Unicode (curly quotes U+2018/
U+2019/U+201C/U+201D, em-dash U+2014, etc.) instead of raw Latin-1 control
bytes that rendered as ◆ in the browser.
3. Chapter header cleanup: skip the first page of each bookmark range (decorative
title art page) and strip any run-on title fragment at the start of the first
body page (e.g. 'for New Journeys!I stood atop...' → 'I stood atop...'). The
remaining sentence truncation is a fundamental limitation of this PDF's
PUA-encoded body font (C2_1/Literata) — those glyphs cannot be decoded without
the publisher's private ToUnicode mapping.
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