Test helpers had two inefficiencies: predictable random number generation using PIDs, and fixed 30-second polling intervals for cluster readiness checks.

Changes

• randInt() in test/helpers/config.go: Replace PID-based pseudo-random with crypto/rand for proper uniqueness in resource names
• WaitForClusterReady() in test/helpers/validation.go: Replace fixed 30s sleep with exponential backoff (10s → 60s cap, 2x factor)
• test/go.mod: Add module description comment

Before/After

// Before: predictable, could cause test collisions
func randInt(max int) int {
    return int(os.Getpid()+int(os.Getppid())) % max
}

// After: cryptographically secure
func randInt(max int) int {
    n, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
    if err != nil {
        return int(os.Getpid()) % max
    }
    return int(n.Int64())
}

// Before: always waits 30s between retries
time.Sleep(30 * time.Second)

// After: 10s → 20s → 40s → 60s (capped)
currentBackoff *= backoffFactor
if currentBackoff > maxBackoff {
    currentBackoff = maxBackoff
}

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