Formal interface between the Hermes gateway (RelayAdapter) and the Node
connector repo: handshake, CapabilityDescriptor field table, MessageEvent
inbound envelope with per-platform SessionSource discriminators (Discord
guild_id is REQUIRED for server isolation), outbound action set, /stop
interrupt routing, signed-body verify-at-edge/byte-preserving rule, and the
additive-only contract_version policy. Documents bot-identity-vs-tenant
separation so single-bot consolidation (Phase 6) stays open. Read-first
artifact for the connector implementer.
Phase 1, Task 1.5 of the gateway-relay plan.
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