test(plugins): a Command Center agent item reaches the composer through the real client state

The command-path test now reads workspace and agent through
createPluginClientStateSource over seeded session stores, so an empty
lookup, which makes the Command Center return before calling the item,
would fail it. Also records at the focused-agent publisher that it
publishes in an effect.

packages/app/src/plugins/command-center/registration.tsx

@@ -40,6 +40,9 @@ export function PluginCommandCenterActions() {
   });
   const handedAgentId = agentExists ? focusedAgentId : null;
   // The agent a plugin's `{ focused: true }` composer names is the one handed to agent items.
+  // Known limit: this publishes in an effect, so a command that runs on the first commit after a
+  // route change can still see the previous route's agent. Publishing from a shared
+  // navigation/focus context would remove the gap.
   useEffect(() => {
     publishFocusedAgent(serverId && handedAgentId ? { serverId, agentId: handedAgentId } : null);
     return () => publishFocusedAgent(null);

packages/app/src/plugins/composer-items/source.test.ts

@@ -1,13 +1,13 @@
 import { defineRpc } from "@getpaseo/plugin";
 import type { DaemonClient } from "@getpaseo/client/internal/daemon-client";
-import type { PluginAgentSnapshot, PluginWorkspaceSnapshot } from "@getpaseo/plugin";
 import { PluginTranslationRuntime } from "@getpaseo/plugin/client/host";
 import { QueryClient } from "@tanstack/react-query";
 import { z } from "zod";
 import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import { queryClient } from "@/data/query-client";
 import { useDraftStore } from "@/stores/draft-store";
-import { useSessionStore, type Agent } from "@/stores/session-store";
+import { useSessionStore, type Agent, type WorkspaceDescriptor } from "@/stores/session-store";
+import { createPluginClientStateSource } from "../client-state/source";
 import { buildPluginCommandCenterContributions } from "../command-center/contributions";
 import { publishFocusedAgent } from "../focused-agent";
 import type { InstalledPlugin } from "../types";
@@ -167,40 +167,26 @@ describe("a plugin's composers by reference", () => {
 });
 
 describe("a Command Center item reaching an agent's composer by id", () => {
-  const snapshot: PluginAgentSnapshot = {
-    id: "agent-1",
-    workspaceId: "workspace-1",
-    provider: "claude",
-    status: "idle",
-    createdAt: "2026-08-16T10:00:00.000Z",
-    updatedAt: "2026-08-16T10:00:00.000Z",
-    lastActivityAt: "2026-08-16T10:00:00.000Z",
-    title: null,
-    cwd: "/repo",
-    model: null,
-    currentModeId: null,
-    thinkingOptionId: null,
-    requiresAttention: false,
-    attentionReason: null,
-    parentAgentId: null,
-    labels: {},
-    metadata: {},
-  };
-
-  const workspace: PluginWorkspaceSnapshot = {
+  // The real client-state source reads these stores. A lookup that came back empty would make the
+  // Command Center return before calling the item, and nothing would be reported.
+  const workspace: WorkspaceDescriptor = {
+    createdAt: null,
+    lastUserMessageAt: null,
     id: "workspace-1",
     projectId: "project-1",
     projectDisplayName: "Repo",
     projectRootPath: "/repo",
-    directory: "/repo",
+    workspaceDirectory: "/repo",
     projectKind: "git",
-    kind: "checkout",
+    workspaceKind: "checkout",
     name: "Repo",
     title: null,
+    pinnedAt: null,
     status: "running",
     statusEnteredAt: null,
     archivingAt: null,
     diffStat: null,
+    scripts: [],
   };
 
   function markForReview(rejection?: Error) {
@@ -214,6 +200,7 @@ describe("a Command Center item reaching an agent's composer by id", () => {
     useSessionStore.getState().clearSession(serverId);
     useSessionStore.getState().initializeSession(serverId, client);
     useSessionStore.getState().setAgents(serverId, new Map([["agent-1", agent("agent-1")]]));
+    useSessionStore.getState().setWorkspaces(serverId, new Map([[workspace.id, workspace]]));
     const installed = plugin();
     installed.commandCenterItems = [
       {
@@ -231,11 +218,7 @@ describe("a Command Center item reaching an agent's composer by id", () => {
     const reported: unknown[] = [];
     const [item] = buildPluginCommandCenterContributions({
       plugins: [installed],
-      state: {
-        subscribe: () => () => {},
-        getWorkspace: () => workspace,
-        getAgent: () => snapshot,
-      },
+      state: createPluginClientStateSource(serverId),
       workspaceId: "workspace-1",
       agentId: "agent-1",
       navigation: {