08:38 — [heartbeat] Confirmed GPSK-300 failure on Mn₂Sb (input, relaxed): Cu₂Sb-type structure collapses to P1 triclinic, broadening the known GPSK failure catalog beyond permanent-magnet prototypes.
09:47 — [heartbeat] Confirmed GPSK-300 Mn₂Sb structural failure — triclinic P1 output extends systemic GPSK failure pattern (FePt L1₀, Nd₂Fe₁₄B, Fe₁₆N₂) to Cu₂Sb-type prototype; Orb v3 relaxation output ambiguous (I4/mmm→P1 across symprec levels)
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