When servers keep session/elicitation/task state in process memory, requests must be routed consistently to the same worker. The spec
defines Mcp-Session-Id semantics but doesn’t mention operational implications. Please add a short, non‑normative note in Session Management
(and a cross‑ref in elicitation statefulness) advising implementors to use session affinity or externalize session state so any worker can
handle a request. This helps avoid hangs/404s with multi‑worker load balancing while keeping the protocol requirements unchanged.