sage-eval-gauge

Repo-local Sage eval-gauge / hill-climbing Phase-0 toolkit. Use when an operator, Claude Code, or Codex needs to measure Sage capability with a GROUND-TRUTHED gauge (not substring eval scores), run the Gate Experiment (does the eval track reality?), compare bare-model vs harness, get the noise floor / min-detectable-effect, or score a run from verified range state. The trustworthy "is config A better than B?"…