Replace hand-rolled getCpuCores() with fidry/cpu-core-counter

[Copilot]

The custom Utils::getCpuCores() reimplemented cross-platform CPU detection via shell_exec/wmic/nproc//proc/cpuinfo. Replace it with the battle-tested fidry/cpu-core-counter library.

Changes

• composer.json: Add fidry/cpu-core-counter: ^1.3 to require
• Utils::getCpuCores(): Replace ~50 lines of brittle shell detection with a delegation to CpuCoreCounter::getAvailableForParallelisation()->availableCpus; result is memoized via a static variable to avoid re-detection on repeated calls
• Public method signature is unchanged — callers in PhpCodeParser are unaffected

public static function getCpuCores(): int
{
    static $cores = null;
    if ($cores === null) {
        $cores = (new \Fidry\CpuCoreCounter\CpuCoreCounter())->getAvailableForParallelisation()->availableCpus;
    }
    return $cores;
}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud