GiveCare Backend Specification

GiveCare reference note: "Backend Specification."

Key information used in wiki

• This document is best treated as a target-state architecture spec, not the sole source of truth for the live runtime.
• It remains useful for the intended loop / arbiter / scheduler design direction and for broader backend invariants.
• It also captures the intended safety-first ordering and the idea of a single authoritative routing layer.
• Some older table names and runtime concepts no longer match the live caregiver / conversation / turn-centered Convex schema. Current-tense architecture pages must use the exact verified gc-sms Hound owner projection.