fix(app): preserve History agent unarchive

packages/app/src/utils/navigate-to-agent/index.ts

@@ -64,10 +64,7 @@ function restoreArchivedWorkspace(serverId: string, agentId: string, workspaceId
 
   const store = useSessionStore.getState();
   const session = store.sessions[serverId];
-  // History carries restore intent explicitly. Workspace lifecycle is separate
-  // from agent lifecycle, so a closed non-archived agent can legitimately own an
-  // archived workspace. A present workspace or in-flight restore stays a no-op.
-  if (!session || session.workspaces.has(workspaceId)) {
+  if (!session) {
     return;
   }
   if (session.restoringWorkspaces.get(workspaceId) === "restoring") {
@@ -81,6 +78,23 @@ function restoreArchivedWorkspace(serverId: string, agentId: string, workspaceId
     return;
   }
 
+  // Workspace and agent archive lifecycles are independent. A missing workspace
+  // must restore even when its agent survived unarchived; an archived agent must
+  // still reopen when its workspace survived.
+  if (session.workspaces.has(workspaceId)) {
+    const agent = session.agents.get(agentId) ?? session.agentDetails.get(agentId);
+    if (agent?.archivedAt) {
+      client.refreshAgent(agentId).catch((error) => {
+        console.error("[HistoryRestore] Failed to reopen archived agent", {
+          serverId,
+          agentId,
+          error,
+        });
+      });
+    }
+    return;
+  }
+
   // COMPAT(worktreeRestore): added in v0.1.97, drop the gate when floor >= v0.1.97
   // Single capability read for restore. An old daemon recreates nothing on
   // refresh_agent, so a gone directory would spin then flash a misleading

packages/app/src/utils/navigate-to-agent/restore-archived-workspace.test.ts

@@ -269,12 +269,29 @@ describe("restoreArchivedWorkspace via navigateToAgent", () => {
     expect(status()).toBe("needs-host-upgrade");
   });
 
-  it("is a no-op when the workspace descriptor is already present", () => {
+  it("reopens an archived History agent when its workspace descriptor is already present", () => {
     refreshAgent.mockImplementation(() => new Promise(() => {}));
     useSessionStore.getState().mergeWorkspaces(SERVER_ID, [workspace()]);
 
     openFromHistory();
 
+    expect(refreshAgent).toHaveBeenCalledTimes(1);
+    expect(refreshAgent).toHaveBeenCalledWith(AGENT_ID);
+    expect(status()).toBeNull();
+  });
+
+  it("is a no-op when a non-archived workspace descriptor is already present", () => {
+    const store = useSessionStore.getState();
+    store.setAgents(SERVER_ID, (prev) => {
+      const next = new Map(prev);
+      next.set(AGENT_ID, agent(null));
+      return next;
+    });
+    refreshAgent.mockImplementation(() => new Promise(() => {}));
+    store.mergeWorkspaces(SERVER_ID, [workspace()]);
+
+    openFromHistory();
+
     expect(refreshAgent).not.toHaveBeenCalled();
   });
 });