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Reorder _CODER_MODELS to prefer the 3b coder build over 1.5b. The 3b roughly doubles the ground-truth pass rate on the verify-then-repair native harness (bench: 7/9 vs ~4/9 over the 9 non-net tasks) at a modest CPU-latency cost, so it is auto-selected ahead of 1.5b when present. 7b was evaluated and rejected: too slow to first-token inside the engage window on the CPU-only box. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>