root
1421f9d645
Add capabilities negotiation flow
Changes:
- Server sends 'request_capabilities' after handshake
- Client responds with 'capabilities_response' containing supported features
- Server computes intersection of account + client capabilities
- Effective capabilities used for message validation
- Client metadata stored per-connection
- Updated tests for capabilities negotiation
- Updated CLIENT_SPEC.md documentation
Protocol messages added:
- request_capabilities (server → client)
- capabilities_response (client → server)
ConnectedClient fields added:
- clientCapabilities?: ChannelCapabilities
- clientMetadata?: Record<string, unknown>
- capabilitiesReady: boolean
New methods:
- getEffectiveCapabilities(client) - returns intersection
- clientSupportsCapability(client, capability) - check support