Release 2026-06-26

New manuscript release: all main chapters are now drafted, including the concluding synthesis arc. This version adds part openers, expands the lethality stress test against major doom objections, integrates recent proof-spine updates, and tightens the safety-case framing around what is proved, what remains a bridge assumption, and what is still open. The manuscript is now ready for broader review focused on citation coverage, chapter numbering, appendices, and remaining open technical cruxes.