fix(server): retain feature definitions in stored agent snapshots

Stored fetches dropped saved features that unread and archive updates
already published. Project them through the existing normalizer so both
interfaces expose the same definitions without reopening the runtime.

packages/server/src/server/agent/agent-projections.test.ts

@@ -485,6 +485,43 @@ describe("toAgentPayload", () => {
   });
 });
 
+describe("buildStoredAgentPayload features", () => {
+  it.each([null, "2026-11-01T00:00:00.000Z"])(
+    "preserves saved feature definitions like live snapshots (archivedAt=%s)",
+    (archivedAt) => {
+      const features: AgentFeature[] = [
+        createFeature({ value: false }),
+        {
+          type: "select",
+          id: "service_tier",
+          label: "Service tier",
+          value: "default",
+          options: [
+            { id: "default", label: "Normal" },
+            { id: "fast", label: "Fast" },
+          ],
+        },
+      ];
+      const agent = createManagedAgent({ features });
+      const record = { ...toStoredAgentRecord(agent), archivedAt };
+
+      const payload = buildStoredAgentPayload(record, [agent.provider]);
+
+      expect(payload.features).toEqual(features);
+      expect(payload.features).toEqual(toAgentPayload(agent).features);
+      expect(payload.features).not.toBe(record.features);
+      expect(payload.features?.[0]).not.toBe(record.features?.[0]);
+    },
+  );
+
+  it("uses an empty feature list for older records without saved definitions", () => {
+    const record = toStoredAgentRecord(createManagedAgent());
+    delete record.features;
+
+    expect(buildStoredAgentPayload(record, [record.provider]).features).toEqual([]);
+  });
+});
+
 describe("toRecentProviderSessionDescriptorPayload", () => {
   it("projects provider import rows to provider-opaque public recent sessions", () => {
     const session: ImportableProviderSession & { provider: string } = {

packages/server/src/server/agent/agent-projections.ts

@@ -263,6 +263,7 @@ export function buildStoredAgentPayload(
     capabilities: defaultCapabilities,
     currentModeId: record.lastModeId ?? null,
     availableModes: [],
+    features: normalizeFeatures(record.features),
     pendingPermissions: [],
     persistence,
     title: record.title ?? null,