WIP: fix archive tab reconciliation (#158)

* WIP: fix archive tab reconciliation

* fix: converge archive into AgentManager for cross-session propagation

CLI archive left agent tabs visible in passive app clients because
Session.archiveAgentState only notified the archiving session's own
subscription. LoopService had the same gap via AgentManager.archiveAgent.

Converge on AgentManager.archiveAgent as the single canonical archive
path: persist updatedAt, call notifyAgentState before closeAgent so all
sessions receive the archived snapshot. Delete Session.archiveAgentState
and make handleArchiveAgentRequest a thin wrapper.

packages/app/src/runtime/host-runtime.test.ts

@@ -6,7 +6,7 @@ import type {
   FetchAgentsOptions,
 } from "@server/client/daemon-client";
 import type { HostConnection, HostProfile } from "@/types/host-connection";
-import { useSessionStore } from "@/stores/session-store";
+import { useSessionStore, type Agent } from "@/stores/session-store";
 import {
   HostRuntimeController,
   HostRuntimeStore,
@@ -112,6 +112,7 @@ function makeFetchAgentsEntry(input: {
   title?: string | null;
   requiresAttention?: boolean;
   attentionReason?: "permission" | "error" | null;
+  archivedAt?: string | null;
 }): FetchAgentsEntry {
   return {
     agent: {
@@ -145,7 +146,7 @@ function makeFetchAgentsEntry(input: {
       requiresAttention: input.requiresAttention ?? false,
       attentionReason: input.attentionReason ?? null,
       attentionTimestamp: input.requiresAttention && input.attentionReason ? input.updatedAt : null,
-      archivedAt: null,
+      archivedAt: input.archivedAt ?? null,
       labels: {},
     },
     project: {
@@ -1134,6 +1135,93 @@ describe("HostRuntimeStore", () => {
     useSessionStore.getState().clearSession(host.serverId);
   });
 
+  it("rehydrates archived agents over stale active session state after reconnect bootstrap", async () => {
+    const host = makeHost({
+      serverId: "srv_archived_rehydrate",
+      connections: [
+        {
+          id: "direct:lan:6767",
+          type: "directTcp",
+          endpoint: "lan:6767",
+        },
+      ],
+    });
+    const fakeClient = new FakeDaemonClient();
+    fakeClient.setConnectionState({ status: "connected" });
+    fakeClient.fetchAgentsResponses.push(
+      makeFetchAgentsPayload({
+        entries: [
+          makeFetchAgentsEntry({
+            id: "agent-archived",
+            cwd: "/Users/moboudra/dev/paseo",
+            updatedAt: "2026-03-30T15:30:00.000Z",
+            archivedAt: "2026-03-30T15:31:00.000Z",
+            title: "Archived remotely",
+          }),
+        ],
+        subscriptionId: "app:srv_archived_rehydrate",
+      }),
+    );
+    const store = new HostRuntimeStore({
+      deps: {
+        createClient: () => fakeClient as unknown as DaemonClient,
+        connectToDaemon: async ({ host }) => ({
+          client: fakeClient as unknown as DaemonClient,
+          serverId: host.serverId,
+          hostname: host.label ?? null,
+        }),
+        getClientId: async () => "cid_test_runtime",
+      },
+    });
+
+    useSessionStore
+      .getState()
+      .initializeSession(host.serverId, fakeClient as unknown as DaemonClient);
+    useSessionStore.getState().setAgents(host.serverId, () => {
+      const stale = makeFetchAgentsEntry({
+        id: "agent-archived",
+        cwd: "/Users/moboudra/dev/paseo",
+        updatedAt: "2026-03-30T15:29:00.000Z",
+        archivedAt: null,
+        title: "Stale active copy",
+      }).agent;
+      const staleAgent: Agent = {
+        ...stale,
+        serverId: host.serverId,
+        createdAt: new Date(stale.createdAt),
+        updatedAt: new Date(stale.updatedAt),
+        lastUserMessageAt: null,
+        lastActivityAt: new Date(stale.updatedAt),
+        archivedAt: stale.archivedAt ? new Date(stale.archivedAt) : null,
+        attentionTimestamp: stale.attentionTimestamp ? new Date(stale.attentionTimestamp) : null,
+      };
+      return new Map([
+        [
+          stale.id,
+          staleAgent,
+        ],
+      ]);
+    });
+
+    store.syncHosts([host]);
+
+    const timeoutAt = Date.now() + 300;
+    let archivedAt =
+      useSessionStore.getState().sessions[host.serverId]?.agents.get("agent-archived")
+        ?.archivedAt ?? null;
+    while (!archivedAt && Date.now() < timeoutAt) {
+      await new Promise((resolve) => setTimeout(resolve, 0));
+      archivedAt =
+        useSessionStore.getState().sessions[host.serverId]?.agents.get("agent-archived")
+          ?.archivedAt ?? null;
+    }
+
+    expect(archivedAt?.toISOString()).toBe("2026-03-30T15:31:00.000Z");
+
+    store.syncHosts([]);
+    useSessionStore.getState().clearSession(host.serverId);
+  });
+
   it("records unavailable startup probes when no connection can be established", async () => {
     const host = makeHost({
       connections: [