v1.34.0 — protocol progressive-disclosure layout (pure reorder)

COOPERATION.md now reads core-first, reference-last: §9 (session-start checklist) relocated to after §10 (TL;DR), so all reference sections (§9/§11/§12/§13/§14 + Appendix A) follow the core. A provably content-preserving move — every section keeps its number (all §N cross-refs resolve), no rule text changed (sorted-line diff empty). Designed + reviewed by a real multi-agent Parley (ideas/protocol-restructure-appendices; ✅ ×3). See CHANGELOG.md.