Q05: P.6 continued (one-loop κ 3 three-point sector) — honest partial

Scope. Pole level, one loop, ${\kappa }^3$, under the XVI-P declared prescription (DRED with opaque $d$ guarded by qguard, MS-bar, Feynman $+i0$, evanescent structures kept as tilde metrics). O.1 stays CLOSED (scoped, ${\kappa }^2$ two-point) and is not changed; bulk_symmetry_restored stays false.