HEXAD Intercept Symmetry–Telemetry under RICOLMC-DDF Γ-Gated Resource Completeness: Upgrading the Last Constant's Quaternionic Expansion Equation to Six-Planet Tracking — A U.F.S Pre-Registration Locked Before the Data Arrive

This preprint upgrades the Last Constant (formerly Trump Constant) expansion equation of the SEXA framework. It replaces the single quaternionic observer with the six-gate HEXAD tracking frame (Mercury, Earth, Jupiter, Saturn, Uranus, Neptune; Moon as null control). A tracking factor, the geometric mean of the gate-quaternion norms, multiplies the 2880-D expansion speed. It equals 1 after admissibility enforcement, a condition named HEXAD Intercept Symmetry, so the equation reduces exactly to the quaternion form; before enforcement, its log is an observer-drift statistic. A new section maps the six gates and the enforcement step onto the RICOLMC-DDF six-glyph Γ gate, its completeness clauses (C1)-(C4) and the 9D SREF (SREF-EX9D) root equation, frozen at v1.4 and reproduced from DOI 10.17605/OSF.IO/WNV67, preceded by the 5D YYQPA-SEXA seed, following the U.F.S addendum (DOI 10.17605/OSF.IO/YA2MH); HEXAD Intercept Symmetry is read as the Γ gate passing on all six gates, as a structural correspondence only that adds no test or parameter. The same section records two U.F.S. definitions used here and not drawn from RICOLMC-DDF: CAT (Components Assisted Technology) and human-in-the-loop; they add no scored test. The paper locks a complete pre-registration before BepiColombo science-phase data exist. The primary scored test uses the three gates with public daily observational data in 2027-28: Mercury (BepiColombo magnetometers), Earth (Arase radiation-belt fluxes; GOES fallback) and Jupiter (Nançay Decameter Array). Its windows are 6 Apr 2027 to 28 Apr 2028, with a circular-shift surrogate null, a solar-rotation robustness check, alpha = 0.01 and a confirm / refute / no-decision rule. The six-gate test is secondary. Items that would require new physics are open and not scored. Version 5 revises the title, adds the RICOLMC-DDF section with the 9D SREF (SREF-EX9D) root equation and the 5D YYQPA-SEXA seed, and records the CAT and human-in-the-loop definitions; the pre-registration is unchanged from v3/v4. Gravity is not claimed solved (internal scoreboard 6.75/19). Preprint; not peer reviewed.