fix(hosts): share daemon links across isolated routed sessions

Multiplex logical sessions over the monitored daemon connection and wrap original binary bytes in routing headers. Admit channels under their authenticated parent and current grants; preserve scoped delivery and physical send completion.

packages/client/src/node/buffering.ts

@@ -1,7 +1,7 @@
 /** Counts bytes until the socket's send callback, shared by all links owned by a daemon. */
 export class HostTransportBudget {
   private used = 0;
-  constructor(readonly limit = 64 * 1024 * 1024) {}
+  constructor(readonly limit = 256 * 1024 * 1024) {}
   get bufferedBytes(): number {
     return this.used;
   }