refactor: replace try/finally with t.after() hooks in tests

[Copilot]

Test cleanup for undici MockAgent (close + restore global dispatcher) was done in try/finally blocks. Using t.after() is the idiomatic pattern for the Node.js built-in test runner and keeps cleanup co-located with setup rather than buried at the end of test logic.

Changes

• src/integration_test.ts: Register t.after() hook immediately after setGlobalDispatcher(mockAgent) to close the agent and restore the original dispatcher
• src/top_test.ts: Same refactor across all 9 test cases — hook registered right after systemUnderTest() (which internally calls setGlobalDispatcher)

Before

it('should ...', async () => {
    const originalDispatcher = getGlobalDispatcher();
    const [topPodsFunc, _, mockAgent] = systemUnderTest();
    // setup interceptors...
    try {
        const result = await topPodsFunc();
        // assertions...
    } finally {
        await mockAgent.close();
        setGlobalDispatcher(originalDispatcher);
    }
});

After

it('should ...', async (t) => {
    const originalDispatcher = getGlobalDispatcher();
    const [topPodsFunc, _, mockAgent] = systemUnderTest();
    t.after(async () => {
        await mockAgent.close();
        setGlobalDispatcher(originalDispatcher);
    });
    // setup interceptors...
    const result = await topPodsFunc();
    // assertions...
});

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