proven_c_lib-v26.09.04a

Changed

• The manual's front page is the contents and the copyright, nothing else.
  Each edition's index used to be the spine — intent, build model, global
  contracts, the ownership matrix, behaviour classes, header map, platform
  support — with the table of contents underneath. Now, like the book, the
  index is the full contents (every chapter and every section) followed by the
  copyright, and the ↑ button in every chapter lands there. The spine moved
  into Chapter 0 as §6–§15, after the plain-language sections that always
  referred to it as "the formal versions"; appendices B, C and D sit side by
  side. Chapter 0's glossary, libc map and closing section renumber to 13, 15
  and 16, and every link to the old anchors follows. Chapter 0 joins the
  code-block gate in nob.c so the five blocks that moved stay checked.
• docs/index.html, the landing page above both editions, carries the full
  contents of both — every chapter and every section, linked into the
  edition — instead of two bare language links. scripts/site_root.py writes
  it from the contents each edition's build leaves behind; the link checker
  follows its links and the web-font subset includes its characters.