Deliver a raw JSON-RPC payload as an SSE message event to the single
stream whose minted session token is sessionId, so a response is routed
only to the client that issued the corresponding POST and never leaks across
sessions. A listener whose write throws (a disconnected client) is dropped so
the channel self-heals. An empty payload, or an unknown/empty token (no
matching open stream), is a no-op.
Deliver a raw JSON-RPC payload as an SSE message event to the single stream whose minted session token is sessionId, so a response is routed only to the client that issued the corresponding POST and never leaks across sessions. A listener whose write throws (a disconnected client) is dropped so the channel self-heals. An empty payload, or an unknown/empty token (no matching open stream), is a no-op.