fix: fire onPeerDisconnect before session cleanup mutates meta

_emitSessionDisconnected -> streaming's _onSessionDisconnected clears
meta.subscribedStreams in place. onPeerDisconnect ran after that, so
consumers never saw the raw session meta the doc comment promises.

Also updates the adapters/dev API snapshot for the new
onPeerConnect/onPeerDisconnect options, which CI caught as stale.

Author: dvcolomban

packages/devframe/src/node/server.ts

@@ -232,8 +232,8 @@ export async function startHttpAndWs(options: StartHttpAndWsOptions): Promise<St
         }
       : undefined,
     onDisconnected: (peer, meta) => {
-      rpcHost._emitSessionDisconnected(meta)
       options.onPeerDisconnect?.(peer, meta)
+      rpcHost._emitSessionDisconnected(meta)
     },
   })
 

tests/__snapshots__/tsnapi/devframe/adapters/dev.snapshot.d.ts

@@ -13,6 +13,8 @@ export interface CreateDevServerOptions {
   openBrowser?: boolean | string;
   auth?: boolean | DevframeAuthHandler;
   mcp?: boolean | McpRouteOptions;
+  onPeerConnect?: (_: Peer, _: DevframeNodeRpcSession) => void;
+  onPeerDisconnect?: (_: Peer, _: DevframeNodeRpcSessionMeta) => void;
   onReady?: (_: {
     origin: string;
     port: number;