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Add superseded/non-certifying banner (14/14 false-dead audit)

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  1. SUPERSEDED_NONCERTIFYING.md +13 -0
SUPERSEDED_NONCERTIFYING.md ADDED
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+ # ⚠️ SUPERSEDED — NON-CERTIFYING (2026-08-05)
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+ These 5 arena matrices (2026-08-01/02) were produced by a **6-model local fleet** and must
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+ **NOT** be used to certify item deadness. Independent audit (all 5 swept):
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+
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+ - **14 of 14 "certified-dead" calls are FALSE** — every one has gradable-N = 0 (all models returned `unmeasured`).
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+ - 2 matrices (0219, 0226) are **100% unmeasured** (`n_measured: 0, accuracy: None`) — they graded nothing.
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+ - The 6-model fleet returns `unmeasured` on 40–100% of governance items; it structurally cannot certify.
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+ **Correct certification requires:** exclude `unmeasured` from the unanimity denominator, require a minimum
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+ gradable-N per item, and a ≥19-model fleet gate (per the certifier). Re-certify with a fleet that answers.
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+
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+ These files are retained for provenance only. See CC_matrix_sweep_finding.json.