Open-source 9-task benchmark for coding-agent retrieval augmentation. Per-task deltas +0.010 to +0.320, all evals reproducible [P]

Sharing an open-source benchmark suite ( paper-lantern-challenges ) that measures coding-agent performance with vs without retrieval-augmented technique selection across 9 everyday software tasks. Disclosure: I'm the author of the retrieval system under test (paperlantern.ai/code); the artifact being shared here is the benchmark suite itself, not the product. Every prompt, agent code path, and prediction file is in the repo and reproducible. Setup.