Mulciber desktop OS layer

mulciber-platform is the experimental desktop OS layer of the Mulciber native game-development stack. It owns native application connections, windows, event pumping, drawable metrics, and borrowed graphics surface targets without imposing a cross-platform windowing framework.

Version 0.4.0 contains peer native AppKit, Win32, Wayland, and X11 implementations exercised by Mulciber's Metal and Vulkan probes. New in this version, Window::set_cursor_mode expresses a pointer-capture intent the platform owns: while capture is applied the cursor is hidden and pinned, motion arrives as relative PointerDelta input events, the intent survives focus loss and reapplies on focus gain, and dropping the window always restores the system cursor. The AppKit implementation is physically verified for relative mouse-look; Win32, Wayland, and X11 report an explicit unsupported error for capture until their tiers are exercised. Wayland and X11 input implementations remain in progress, as do display enumeration, multi-window support, and a stable application-facing API. The current API is research-stage and may change without compatibility guarantees. On docs.rs, use the target selector to view the implementation available for each operating system.

Development, design contracts, runnable probes, and recorded validation evidence live in the Mulciber repository.