$16 refactor, 400 steps, 95% routed to open MoE

In three linesDeveloper cuts Claude Opus costs from $160 to $16 by routing 95% of steps to Hunyuan Hy3 (21B MoE) via vLLM routing layer. On 400-step Python refactoring, Hy3 handles 380 steps at $0.02 each ($7.60), Opus handles remaining 20 ($8). 93.4% success rate, but fails on complex dependency graphs.

Summary generated by Claude — human-verified