fix: CI test failure — TempDir cleanup race in process test

[dmitriimaksimovdevelop]

Problem

TestProcessTopByCPU_SortRegression fails on Go 1.25+ CI:

TempDir RemoveAll cleanup: unlinkat .../001: directory not empty

A goroutine writes to TempDir after 1ms delay. Go 1.25 made t.TempDir() cleanup stricter — it now fails the test if removal fails. The goroutine could still be writing when cleanup starts.

Fix

done := make(chan struct{})
go func() {
    defer close(done)
    // ...write files...
}()
t.Cleanup(func() { <-done })

Ensures goroutine finishes before TempDir removal. Verified: 5/5 passes locally.

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