The Repair Station: Weak-Force Transmutation and the Klein Bottle Eigenvalue — Nuclear Waste as the Operator's Queue

The Klein bottle eigenvalue β⁻¹ = 43.619 has floor 43 — technetium, the lightest element with no stable isotopes. Every technetium isotope decays exclusively by beta decay (weak force). This paper shows: (1) the weak force is the only fundamental interaction that changes one element into another via quark flavour conversion; (2) every long-lived fission product in the nuclear waste inventory resolves to a stable endpoint through beta decay; (3) technetium is not waste but the nuclear-scale fixed point of the constraint surface — the Le Chatelier product that absorbs excess neutrons and dampens the chain reaction. What oxygen is to chemistry, technetium is to nuclear physics. The gap at Z = 43 is the repair station. Companion to papers on tetrahedral zinc geometry (2026q), Klein bottle eigenvalue (2026k), and the oxygen fixed point (2026i).