fix(cli): satisfy lint on ao open changes

- replace inline `import("node:child_process")` type annotation in vi.mock
  with a top-of-file `import type * as ChildProcess` (consistent-type-imports)
- drop the `[]` initializer on `sessionsToOpen` since every branch assigns
  before any read (no-useless-assignment)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/cli/__tests__/commands/open.test.ts

@@ -1,3 +1,4 @@
+import type * as ChildProcess from "node:child_process";
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 
 const {
@@ -21,7 +22,7 @@ const {
 }));
 
 vi.mock("node:child_process", async (importOriginal) => {
-  const actual = await importOriginal<typeof import("node:child_process")>();
+  const actual = await importOriginal<typeof ChildProcess>();
   return { ...actual, spawn: mockSpawn };
 });
 

packages/cli/src/commands/open.ts

@@ -91,7 +91,7 @@ export function registerOpen(program: Command): void {
       // live sessions. For a named lookup the user is asking about a specific
       // session, so we keep terminated ones in scope and open the dashboard
       // so they can read the transcript even if the agent has died.
-      let sessionsToOpen: Session[] = [];
+      let sessionsToOpen: Session[];
 
       if (!target || target === "all") {
         sessionsToOpen = all.filter((s) => !isTerminalSession(s));