Documentation map

Start with the document that matches the question:

Public and feature documents:

• PUBLIC_SNAPSHOTS.md defines the dated anonymous public-record
  format, complete class registry, hash recipe, and offline verification contract.
• published/FRONTDOOR.md is the voice north star and mirrors
  the public front-door body.
• features/HOSTED_CHAT_SIGNIN.md defines the hosted-chat
  authorization and recovery release boundaries.

Operations:

• runbooks/PUBLIC_SNAPSHOTS.md covers restricted
  export setup, manual dry runs, append-only publication, and separate errata.
• runbooks/DEPLOYMENT.md explains how a GitHub commit reaches
  production and how to verify or roll it back.
• runbooks/BACKUP_RESTORE.md covers Neon snapshots, local
  backups, restore drills, and recovery evidence.
• runbooks/SIGNIN_RETENTION.md states how long each
  sign-in record type lives, how pruning rides ordinary OAuth traffic, and how
  backup rotation bounds what deletion leaves behind.
• runbooks/ENVIRONMENT.md records which ignored environment
  files are active, duplicated, or temporary without exposing their values.

audits/ receives incoming audit findings. Superseded plans and resolved
question history stay under archive/ so current guidance remains short
without erasing project history.