I built a modern C multitask engine (GC + Arena) in a single header — looking for technical feedback

[ALightbolt4G]

Hey C Devs,
​I’ve been spending my free time building a toolkit to make C development less of a manual memory nightmare. It's called CM Library (v4.2.1).
​I’m tired of choosing between the safety of a Garbage Collector and the raw speed of Manual Management, so I combined both into one engine.
​🔗 Repository: https://github.com/ALightbolt4G/CM---C-Multitask-Runtime-Engine
​Why bother?
​🚀 Dual-Memory System: Use an Arena Allocator for high-performance, short-lived tasks (O(1) allocation) and a Garbage Collector for long-lived complex objects.
​🧩 OOP in C: Simple macros to handle classes, properties, and methods without the boilerplate.
​🔒 Thread-Safe: Mutex-protected core, ready for multi-threaded applications.
​⚠️ Modern Error Handling: Actual cmTry/cmCatch blocks because goto is not always the answer.
​📦 Zero Dependencies: Just one .h file. Drop it in and you're good to go.
​I built this primarily for my own use cases (Game engines / CLI tools), but I’d love to get some feedback on the memory alignment and the GC’s mark-and-sweep implementation from this community.
​Check it out, and if you find it useful, a star on GitHub would be appreciated!