Heusler decoration check receipts (C1b controls, 24-assignment quotient)

Receipts for the 2026-09-23 C1b control verification: TiNiSn/TiCoSb decorations checked by coordination fingerprint and StructureMatcher; all 24 TiNiSn decorations quotient to 3 isometry classes (all F-43m); Wyckoff-letter spelling evidence; two caveats in the origin-shift fingerprint tool (absolute nn cutoff, class not inversion-closed).