A7U: Distributed Planck Bundles, Intrinsic Space Fluctuations, and the No-Pure-Particle Theorem

A7U is a parameter-free extension of Quantum Traction Theory's bundled-existence axiom A7. Canonical A7 says each active world-cell address closes a fixed 2π modular budget and carries a complete Planck bundle. A7U removes the last hidden-sector ambiguity: the complement of any local visible particle is not an arbitrary unseen substance, but the visible modular share of the other A5-entangled co-members of the same w-bundle. The full distributed bundle is exactly pure; every strict laboratory subsystem is exactly mixed. The headline theorem is the no-pure-particle theorem: a laboratory can prepare states with arbitrarily high operational purity in an accessible subspace, but no single elementary particle is…