fix: move createSessionFsAdapter to value export block

createSessionFsAdapter is a runtime function, not a type. It was
incorrectly placed inside the 'export type { ... }' block which
would erase it during compilation. Move it to the value export
block alongside defineTool, approveAll, etc.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

nodejs/src/index.ts

@@ -14,6 +14,7 @@ export {
     defineTool,
     approveAll,
     convertMcpCallToolResult,
+    createSessionFsAdapter,
     SYSTEM_PROMPT_SECTIONS,
 } from "./types.js";
 export type {
@@ -68,7 +69,6 @@ export type {
     SessionFsConfig,
     SessionFsProvider,
     SessionFsFileInfo,
-    createSessionFsAdapter,
     SystemMessageAppendConfig,
     SystemMessageConfig,
     SystemMessageCustomizeConfig,