# @repo/core-realtime

Vendor-isolated realtime abstractions over Socket.IO. Feature packages depend only on the interfaces; only this package imports `socket.io`.

ADR-016 (`docs/decisions/adr-016-realtime-layer.md`).

## Public exports

- `IRealtimeBroadcaster` — server → client broadcasts
- `IRealtimeServer` — lifecycle, used at app boot only
- `IRealtimeAuthenticator` — connect-time identity attachment (cookie / header → user)
- `IRealtimeHandlerRegistry` + `RealtimeHandlerRegistry` — inbound handler registration
- `defineRealtimeChannel`, `RealtimeChannelDescriptor`, `ChannelScope`
- `InMemoryRealtimeBroadcaster` (test/dev), `SocketIORealtimeBroadcaster`, `SocketIORealtimeServer` (production)
- `CORE_REALTIME_SYMBOLS`

## Boundary

Tagged `core`. The only place in the repo where `import "socket.io"` is allowed is `src/socket-io-*.ts` here, plus `apps/*/server.ts`. Enforced by the ESLint rule `core-eslint/no-direct-socket-io`.
