ARC Retain Cycle Lab 2D

A live 2D reference-counting heap in the style of iOS's Automatic Reference Counting, rendered as a pannable, zoomable node graph instead of a 3D scene. Allocate objects, wire strong or weak references between them, and release the root ("stack variable") holding any object — watch ARC deallocate objects the instant their retain count hits zero, cascading through chains of ownership exactly as a real Objective-C/Swift runtime does. The one-click demos build a classic retain cycle (two objects strongly holding each other, invisible to the reachability scan yet never freed), show the same graph fixed by turning one edge into a weak reference, or stress-test the heap with random allocation/wiring churn. Sliders tune layout spacing, animation speed and node size live; toggles switch retain-count labels, leak-pulse highlighting and the background grid; a scrolling event log and a live node table track every allocation, wiring change and deallocation as it happens.