feat: remove legacy alert rules, superseded by automations

Alert rules already auto-migrate into automations on boot and the old
engine stands down after. Deletes the rule/firing tables, routes, UI,
and AI tools; keeps notification channels since automations still use
them. Also fixes automations' notify step, which still called the
deleted repository.

src/ui/tests/api/alerts-api.test.ts

@@ -1,45 +0,0 @@
-import { describe, expect, it } from "vitest";
-import { mapAlertFiring } from "../../api/alerts-api";
-
-describe("mapAlertFiring", () => {
-  it("normalizes sqlite snake_case rows for the alerts UI", () => {
-    expect(
-      mapAlertFiring({
-        id: 9,
-        user_id: "u1",
-        rule_id: 4,
-        host_id: 12,
-        host_name: "db-01",
-        fired_at: "2026-06-30 12:00:00",
-        resolved_at: null,
-        value: 91,
-        message: "CPU threshold exceeded",
-        severity: "critical",
-        acknowledged: 0,
-        rule_name: "CPU",
-      }),
-    ).toEqual({
-      id: 9,
-      userId: "u1",
-      ruleId: 4,
-      hostId: 12,
-      hostName: "db-01",
-      firedAt: "2026-06-30 12:00:00",
-      resolvedAt: null,
-      value: 91,
-      message: "CPU threshold exceeded",
-      severity: "critical",
-      acknowledged: false,
-      ruleName: "CPU",
-    });
-  });
-
-  it("uses safe defaults for malformed rows", () => {
-    const firing = mapAlertFiring({ acknowledged: 1, severity: "bad" });
-
-    expect(firing.id).toBe(0);
-    expect(firing.hostName).toBe("");
-    expect(firing.severity).toBe("warning");
-    expect(firing.acknowledged).toBe(true);
-  });
-});

src/ui/tests/features/ai/labels.test.ts

@@ -16,8 +16,8 @@ describe("humanize", () => {
   });
 
   it("splits snake_case into words", () => {
-    expect(humanize("propose_create_alert_rule")).toBe(
-      "Propose create alert rule",
+    expect(humanize("propose_create_automation")).toBe(
+      "Propose create automation",
     );
   });
 
@@ -51,7 +51,7 @@ describe("fieldLabel", () => {
 describe("toolLabel", () => {
   it("phrases tools as actions rather than function names", () => {
     expect(toolLabel("list_hosts")).toBe("Reading hosts");
-    expect(toolLabel("propose_create_alert_rule")).toBe("Create alert rule");
+    expect(toolLabel("propose_create_fleet")).toBe("Create fleet");
   });
 
   it("covers every tool in the catalog", () => {

src/ui/tests/sidebar/AlertsPanel.test.tsx

@@ -1,131 +0,0 @@
-import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
-import {
-  render,
-  screen,
-  waitFor,
-  cleanup,
-  fireEvent,
-} from "@testing-library/react";
-import type { NotificationChannel } from "@/api/alerts-api";
-
-const alertsApi = vi.hoisted(() => ({
-  getAlertFirings: vi.fn(async () => []),
-  acknowledgeAlertFiring: vi.fn(async () => {}),
-  acknowledgeAllAlertFirings: vi.fn(async () => {}),
-  getAlertRules: vi.fn(async () => []),
-  getNotificationChannels: vi.fn(async () => [] as NotificationChannel[]),
-  deleteAlertRule: vi.fn(async () => {}),
-  deleteNotificationChannel: vi.fn(async () => {}),
-  testNotificationChannel: vi.fn(async () => {}),
-}));
-
-vi.mock("@/api/alerts-api", () => alertsApi);
-
-vi.mock("react-i18next", () => ({
-  useTranslation: () => ({
-    t: (_key: string, fallback?: string) => fallback ?? _key,
-  }),
-}));
-
-// A real (non-null) fake so tests can see what channels actually reach the
-// rule dialog, instead of only asserting the API call count.
-vi.mock("../../sidebar/AlertRuleDialog", () => ({
-  AlertRuleDialog: ({
-    open,
-    channels,
-  }: {
-    open: boolean;
-    channels: NotificationChannel[];
-  }) =>
-    open ? (
-      <div data-testid="rule-dialog-channels">
-        {channels.length === 0
-          ? "no channels"
-          : channels.map((c) => c.name).join(",")}
-      </div>
-    ) : null,
-}));
-vi.mock("../../sidebar/NotificationChannelDialog", () => ({
-  NotificationChannelDialog: () => null,
-}));
-
-import { AlertsPanel } from "../../sidebar/AlertsPanel";
-
-function channel(
-  overrides: Partial<NotificationChannel> = {},
-): NotificationChannel {
-  return {
-    id: 1,
-    userId: "user-1",
-    name: "ntfy",
-    type: "ntfy",
-    config: "{}",
-    enabled: true,
-    createdAt: new Date().toISOString(),
-    ...overrides,
-  };
-}
-
-beforeEach(() => {
-  alertsApi.getAlertFirings.mockReset().mockResolvedValue([]);
-  alertsApi.getAlertRules.mockReset().mockResolvedValue([]);
-  alertsApi.getNotificationChannels.mockReset().mockResolvedValue([]);
-});
-
-afterEach(() => {
-  cleanup();
-});
-
-describe("AlertsPanel - notification channels", () => {
-  it("loads notification channels on mount, before the Channels tab is ever opened", async () => {
-    alertsApi.getNotificationChannels.mockResolvedValue([channel()]);
-
-    render(<AlertsPanel />);
-
-    // Regression: channels used to only load once the user switched to the
-    // "channels" tab, so editing a rule before ever visiting that tab showed
-    // an empty channel picker even though channels existed.
-    await waitFor(() => {
-      expect(alertsApi.getNotificationChannels).toHaveBeenCalledTimes(1);
-    });
-  });
-
-  it("populates the rule dialog's channel picker without ever visiting the Channels tab", async () => {
-    alertsApi.getNotificationChannels.mockResolvedValue([
-      channel({ id: 1, name: "ntfy-home" }),
-      channel({ id: 2, name: "webhook-slack" }),
-    ]);
-
-    render(<AlertsPanel />);
-
-    await waitFor(() => {
-      expect(alertsApi.getNotificationChannels).toHaveBeenCalledTimes(1);
-    });
-
-    // Go straight to Rules and open the "new rule" dialog, skipping Channels
-    // entirely, this is exactly the sequence the original bug broke.
-    fireEvent.click(screen.getByText("Rules"));
-    fireEvent.click(screen.getByText("Add"));
-
-    expect(screen.getByTestId("rule-dialog-channels").textContent).toBe(
-      "ntfy-home,webhook-slack",
-    );
-  });
-
-  it("does not refetch channels again when switching to the Rules tab", async () => {
-    render(<AlertsPanel />);
-
-    await waitFor(() => {
-      expect(alertsApi.getNotificationChannels).toHaveBeenCalledTimes(1);
-    });
-
-    // Switching tabs only reloads rules here, not channels, since channels
-    // were already fetched on mount by the fix under test.
-    fireEvent.click(screen.getByText("Rules"));
-
-    await waitFor(() => {
-      expect(alertsApi.getAlertRules).toHaveBeenCalledTimes(1);
-    });
-    expect(alertsApi.getNotificationChannels).toHaveBeenCalledTimes(1);
-  });
-});

src/ui/tests/sidebar/plugin-extension-seam.test.tsx

@@ -29,10 +29,6 @@ vi.mock("react-i18next", () => ({
   useTranslation: () => ({ t: (key: string) => key }),
 }));
 
-vi.mock("@/api/alerts-api", () => ({
-  getAlertFirings: vi.fn().mockResolvedValue([]),
-}));
-
 vi.mock("@/hooks/use-ai-availability", () => ({
   useAiAvailability: () => ({ userEnabled: false }),
 }));

src/ui/tests/sidebar/rail-items.test.ts

@@ -92,7 +92,6 @@ describe("RAIL_ITEMS", () => {
       "ai",
       "history",
       "session-logs",
-      "alerts",
     ]);
   });
 
@@ -138,7 +137,6 @@ describe("RAIL_ITEMS", () => {
       "ai",
       "history",
       "session-logs",
-      "alerts",
     ]);
   });
 });