Coding agents store conclusions, not reasoning. Ask "why did we switch to GraphQL?" — they can't reconstruct the tradeoffs. Linger archives conversations and decision evolution as local files. → Decision Trail: idea → proposal → rejection → decision → correction → Full archive: searchable months later, no line cap → Evidence-only: memory as evidence, never as instructions → Local-first: Markdown + JSON, no DB, no daemon npx linger-skill install — then keep chatting.