Integrate 24-principle structure; framework essay for the full archive
principles.json now carries 24 entries: 19 published and 5 planned
(apothecary, arithmetic-of-loss, cardinal-principles, the-bear,
who-this-is-not-for), renumbered within the six chapters. The site's
own invariants shaped the integration: planned entries omit bodies and
sources (pages staged in content/staging/principles/), prose YouTube
links are converted to unlinked mentions pending the library expansion
(193 citations, restoration map in
docs/prose-links-pending-library-expansion.json), representative
sources are reconciled to exactly match prose routes (six added, 51
early-era ones staged in docs/principles-staging-2026-08-17.json), and
the coverage stamp stays at the library's honest 108 until the
expansion lands. Framework essay rewritten: full-archive research
stated plainly, the evolution thread named, forthcoming pages listed
per chapter. PrincipleCount 19 -> 24; all tests pass.
