phpstan 4

• GSoC 2026 Final Report: Final Work Done Aug 23, 2026
• GSoC 2026 Week 12: PHPStan Level 6 Progress and Error Cleanup Aug 14, 2026
• GSoC 2026 Week 11: PHPStan Level 5 Completed & Focused Topic Branch Split Aug 7, 2026
• GSoC 2026 Week 10: PHPStan Baseline Reduction Aug 1, 2026