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Introduce server/internal/integrations/channel — the contract every inbound IM integration implements, so the core never learns a platform's event JSON. Four pieces: - Channel interface (Type/Connect/Disconnect/Send/Capabilities) + Factory + Config (channel_type + opaque JSON blob, maps to channel_installation). - Normalized InboundMessage/OutboundMessage envelopes + Source/MediaRef/ ReplyCtx/MsgType/ChatType. Envelope holds only cross-platform-true fields; platform specifics live in Raw, read only by the adapter. - Capability bitmask: declaration only, no degrade logic in core. - Registry: Type->Factory map, last-writer-wins, concurrency-safe. Pure package (no DB/network/platform deps). Foundation for MUL-3515; the lark cutover + lark_*->channel_* generalization land in follow-up PRs. MUL-3515 Co-authored-by: multica-agent <github@multica.ai>