Unit 7 (hallucination): split criterion 2 (MEDIUM, preserve-by-default)#166
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…-default) Per docs/RUBRIC_AUDIT.md (MEDIUM): old c2 bundled 'names a concrete failure mode' with 'explains the mechanism.' Splits into name-the-failure-mode c2 and a new c3 (explain the mechanism); renumbers regime distinction to position 4. Rubric grows 3 -> 4. Preserve-by-default: faithful decomposition of locked Opus values (old-c2=T -> c2=T,c3=T). p007 is the lone c2=T/c3=F differential (names the mitigation-only failure without the volume-compound mechanism, per its label); p009/p011 name no failure mode -> c2=F, c3=F. No realignments. c4 (regime) carries old-c3 unchanged. Updated p007/p011 labels for the 4-criterion shape. Gate-exempt (faithful split, zero realignments per docs/REGRESSION_GATE.md). Known-bad p018 ERROR unaffected. Local lint, schema check, ingest-check, pytest all pass.
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Summary
Unit 7 (
hallucination), sixth of the MEDIUM batch, faithful preserve-by-default split. Gate-exempt per the rule merged in PR #165.Rubric (3 → 4): c1 unchanged · c2 = name the failure mode · c3 (NEW) = explain the mechanism · c4 = regime distinction (was c3).
Decomposition
Post-split distribution (21 pairs)
8 × 4-of-4 · 3 × 3-of-4 (p006, p007-differential, p014) · 1 × 2-of-4 (p010) · 2 × 1-of-4 (p009, p011) · 5 on-topic-all-missed · 2 off-topic.
Notes
Local validation
lint_unit_markdown/ingest_units --check— cleanrun_regression_set --check— 21 pairs validpytest— 20/20Ready to merge (no gate run required).
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