[herd,cat] Tentative ordering requirements for strengthening FEAT_ETS#1689

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Commits on Mar 20, 2026

[cat] Generalizing *-intrinsically-before relations as Immediately-intrinsically-before
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[cat] Elaborating the scope of the ordering rules known only to apply to the effects due to D-side MMU
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[herd,cat] Tentative ordering requirements for FEAT_ETS4
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