V.R470 — V.OP9 Status: PARTIAL-IMPROVED

V.OP9 (21cm predictions) upgraded from OPEN to PARTIAL-IMPROVED. Brightness temperature uses exclusively τ-native inputs (Ω_m, ω_b, z_reion) with zero free parameters. Absorption trough −209 mK testable by HERA/SKA. Remaining gap: spin coupling function x_α(z).