corpus: KO collection wave (measure-only, G007)#491
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Wave 1 of the approved corpus-expansion plan. Measure-only: no detector
threshold change, no src/features change.
Manifest artifacts/rebaseline-2025/manifest.ko.scored.public.jsonl (380 rows,
hash-only): 250 natural-human controls + 120 ai-like positives across 3 model
families (gpt 40 / claude 40 / gemini 40) + 5 lightly-edited-ai + 5
heavily-edited-ai (one light + one heavy per register). Raw text stays in the
gitignored private workspace; only hashes/metadata/scores are committed.
Reports (docs/benchmarks/):
- rebaseline-ko-latest.{md,json}: accuracy 75.0%, recall 59.2%, FP 16.8%;
catch rate by family gpt 50% / claude 62.5% / gemini 67.5%. Public claim gate
stays BLOCKED (per-family n<100 is an explicit measure-only Non-Goal).
- rebaseline-low-fpr-ko-latest.{md,json}: B4 TPR@1%/5%FPR for ko and
ko x register. Overall TPR at 5% FPR is 0.0% — high-scoring human controls
block low-FPR operation, the honest "corpus is hard" outcome.
- rebaseline-audit-ko-latest.md: operator audit of perfect/boundary cases;
0 mislabeled, 0 too-easy.
Verify: npm test 766/766; npm run benchmark 100% / ROC-AUC 1.000 / PR-AUC 1.000;
benchmark:report, benchmark:robustness, check:no-private-assets, lint all pass.
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Summary
Wave 1 of the approved corpus-expansion plan (
.gjc/plans/ralplan/2026-06-03-1359-33c4). Measure-only: no detector threshold change, nosrc/featureschange.What's in the manifest
artifacts/rebaseline-2025/manifest.ko.scored.public.jsonl— 380 hash-only rows:ai-likepositives across 3 model families (gpt 40 / claude 40 / gemini 40)lightly-edited-ai+ 5heavily-edited-ai(one light + one heavy per register)Raw text stays in the gitignored private workspace; only hashes/metadata/scores are committed.
.gitignoreallowlists the new hash-only manifest.Findings (docs/benchmarks/)
koandko × register. Overall TPR at 5% FPR is 0.0% — high-scoring human controls block low-FPR operation (the honest "corpus is hard" outcome motivating a future, separately-approved calibration delta).Verification
npm test766/766npm run benchmark100% / ROC-AUC 1.000 / PR-AUC 1.000 (baseline fixtures unchanged)benchmark:report,benchmark:robustness,check:no-private-assets,lintall pass