Merge remote-tracking branch 'origin/master' into worktree/web-background-tasks-display-258f7e

packages/client/test-runtime/src/sessions.ts

@@ -368,7 +368,7 @@ export class TestSessions implements ISessions {
   }
 
   /**
-   * Read the session scope tag off a context (service-method seam mirror).
+   * Read the session scope tag off a context (service-method boundary mirror).
    * @param ctx - any client context.
    * @returns the session id, or undefined on root contexts.
    */
@@ -430,6 +430,14 @@ export class TestSessions implements ISessions {
     return Promise.resolve()
   }
 
+  /** Apply a confirmed preset switch into the fixture list, as production does. */
+  noteAgentPreset(sessionId: SessionId, agentPreset: string): void {
+    this.list.update((draft) => {
+      const summary = draft.byId[sessionId]
+      if (summary !== undefined) draft.byId[sessionId] = { ...summary, agentPreset }
+    })
+  }
+
   /** Clear the current selection (recorded; the production no-session flow). */
   clear(): void {
     this.calls.push({ method: 'clear', args: [] })