feat: add versioned evaluation report regression diff - #33
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Add diff_versioned_reports() and a --diff CLI flag that compares two --json evaluation reports and surfaces added/removed case IDs, cases that flipped pass/fail (split into regressions and fixed), rubric dimensions that lost their hard gate, and corpus version drift. Exits non-zero on a failing current run or a detected regression. This closes Week 6's exit gate: a repeatable regression report existed since Day 1, but nothing made two reports easy to compare, so a reviewer had to eyeball two full JSON dumps to notice a case quietly stopped passing. Replaces the leftover generic Week 6 roadmap bullets (which restated Day 1's work) with a single Day 5 closeout line. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Add diff_versioned_reports() and a --diff CLI flag that compares two --json evaluation reports and surfaces added/removed case IDs, cases that flipped pass/fail (split into regressions and fixed), rubric dimensions that lost their hard gate, and corpus version drift. Exits non-zero on a failing current run or a detected regression.
This closes Week 6's exit gate: a repeatable regression report existed since Day 1, but nothing made two reports easy to compare, so a reviewer had to eyeball two full JSON dumps to notice a case quietly stopped passing.
Replaces the leftover generic Week 6 roadmap bullets (which restated Day 1's work) with a single Day 5 closeout line.