MASTER OS 1.9 — Control-Role Architecture: Technical Validation Record, Version 1.0

Technical validation record for MASTER OS 1.9 — Control-Role Architecture within the Rigid-Sync / MASTER OS framework. This record documents a preregistered Minimal Role-Assignment Test and a fresh-Seed Reduction Challenge. Role Assignment produced a reproducible system-level effect across all three tested Plants under controlled Timing, Authority magnitude, Spatial application, objective-level Authority proxy, and fixed channel operators. A subsequent fresh-Seed Reduction Challenge held the R2 Role Assignment fixed while allowing five preregistered gain-redistribution conditions. None of the tested gain arms reproduced the REF_R1 behavior under the preregistered equivalence criterion. The resulting decision was REDUCTION NOT SUPPORTED WITHIN TESTED GAIN SPACE. MASTER OS 1.9 is therefore promoted as an independent tested architectural axis addressing “Who does what?” within the tested framework. The reduction conclusion is explicitly limited to the tested preregistered gain space and does not claim irreducibility under every conceivable gain schedule or universal hardware validity.