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One code-grounded internal guide per backend service (Responsibility / Data / Kafka / API surface / Gotchas), authored by parallel per-service agents reading each service's own source, then an adversarial verify pass (DB names, topics, endpoints spot-checked against code — 0 hard errors). Several guides correctly document CODE over stale CLAUDE.md (remote = HTTP long-poll not WebSocket; analytics = has a DB, not stateless; devices = has its own backend). Unconfirmed facts are marked (unverified). audience: internal, all DRAFT. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>