docs(changeset): add closeStandaloneSSE migration target

Author: felixweinberger

.changeset/ctx-flat-compat-getters.md

@@ -3,4 +3,4 @@
 '@modelcontextprotocol/server': patch
 ---
 
-v1-compat: add `@deprecated` flat fields (`signal`, `requestId`, `_meta`, `authInfo`, `sendNotification`, `sendRequest`, `taskStore`, `taskId`, `taskRequestedTtl`) on the handler context (`ClientContext`/`ServerContext`) mirroring the nested `ctx.mcpReq` / `ctx.http` / `ctx.task` fields, plus the `RequestHandlerExtra` type alias. Covers the common v1 `extra.*` accesses; HTTP-transport-specific fields (`requestInfo`, `closeSSEStream`, `closeStandaloneSSEStream`) are not shimmed and require migration to `ctx.http?.req` / `ctx.http?.closeSSE`.
+v1-compat: add `@deprecated` flat fields (`signal`, `requestId`, `_meta`, `authInfo`, `sendNotification`, `sendRequest`, `taskStore`, `taskId`, `taskRequestedTtl`) on the handler context (`ClientContext`/`ServerContext`) mirroring the nested `ctx.mcpReq` / `ctx.http` / `ctx.task` fields, plus the `RequestHandlerExtra` type alias. Covers the common v1 `extra.*` accesses; HTTP-transport-specific fields (`requestInfo`, `closeSSEStream`, `closeStandaloneSSEStream`) are not shimmed and require migration to `ctx.http?.req` / `ctx.http?.closeSSE` / `ctx.http?.closeStandaloneSSE`.