fix(tess): harden durable recovery namespaces

packages/agent/src/tess-durable-session.test.ts

@@ -6,6 +6,7 @@ import {
 } from './tess-durable-session.js';
 
 const IDENTITY: DurableSessionIdentity = {
+  agentName: 'Nova',
   sessionId: 'tess-session-1',
   tenantId: 'tenant-1',
   ownerId: 'owner-1',

packages/agent/src/tess-durable-session.ts

@@ -1,4 +1,6 @@
 export interface DurableSessionIdentity {
+  /** Provisioned roster identity; isolates durable state between named agents. */
+  agentName: string;
   sessionId: string;
   tenantId: string;
   ownerId: string;
@@ -220,7 +222,13 @@ export class DurableSessionCoordinator {
   }
 
   private assertIdentity(identity: DurableSessionIdentity): void {
-    this.assertRecord(identity.sessionId, identity.tenantId, identity.ownerId, identity.providerId);
+    this.assertRecord(
+      identity.agentName,
+      identity.sessionId,
+      identity.tenantId,
+      identity.ownerId,
+      identity.providerId,
+    );
     if (identity.runtimeSessionId.trim().length === 0) {
       throw new Error('Durable runtime session identity is required');
     }
@@ -410,6 +418,7 @@ export class InMemoryDurableSessionStore implements DurableSessionStore {
 
 function identitiesEqual(left: DurableSessionIdentity, right: DurableSessionIdentity): boolean {
   return (
+    left.agentName === right.agentName &&
     left.sessionId === right.sessionId &&
     left.tenantId === right.tenantId &&
     left.ownerId === right.ownerId &&