feat: Phase 3 wired + plant tool + MoE bus + model distribution always-on

fix: 0 test failures; FileService; real RagService; emergency probe; chat return

feat: impl_ref gaps closed — Nemotron/OpenBMB backends, spec refs, extended UI, HOWTO, multi-node E2E

feat: implement all M01-M13, X01-X04 modules + quality gate fixes