Phase 57: Mixture of Experts & Sparse Model Architectures — 5 wiki pages (337 total) - Phase-57-Expert-Router.md: top-k gating, Switch routing, expert choice, hash routing, capacity management - Phase-57-Sparse-Expert-Layer.md: conditional computation, expert parallelism, SwiGLU/GEGLU experts - Phase-57-Load-Balancer.md: auxiliary losses, dead expert revival, Sinkhorn balancing - Phase-57-Expert-Merger.md: expert pruning, spectral merging, MoE-to-dense distillation - Phase-57-MoE-Orchestrator.md: end-to-end pipeline, scaling laws, inference optimization - _Sidebar.md: added Phase 57 section