CJC Runtime System
Provides the core runtime infrastructure for the CJC programming language:
Buffer<T>: Deterministic memory allocation with COW (Copy-On-Write) semanticsTensor: N-dimensional tensor with element-wise ops, matmul, and stable reductionsObjectSlab/GcRef: Deterministic RC-backed object slab (replaces mark-sweep GC)FrameArena/ArenaStore: Bump-arena per function frame for non-escaping valuesValue: Tagged union for the CJC interpreteraccumulator: BinnedAccumulator for order-invariant deterministic summationdispatch: Hybrid summation strategy dispatch (Kahan vs Binned)