Docs consolidated: README, AGENTS, HANDOVER, CHECKLIST at the root; PLAN, DOCMAP,
ENVIRONMENT-FACTS, PAPERCLIP-API-NOTES, OPEN-ISSUES, FALLBACK-OMA, WHAT-WE-ARE-BUILDING
under docs/. DOCMAP names the one home for each. The closed project's copies now carry a
'Superseded' banner pointing here, so there are not two versions of anything.