Public note on the H12 prototype-neighborhood map: what the measures are, what the labels mean, and an explicit invitation to challenge the prototype and synthesis-plausibility labels rather than rerun the calculations.

Literature half of the H12 close-out: every reported binary Mn-Bi phase with citations, deliberate nulls with reasons, and the unreported D019 Mn3Bi anchor row.

Retrospective The relax-to-anisotropy contract quest resolved all 14 items and drew five quality views, but no external comments, reactions, downloads, or contributed artifacts. The later H9 work did obtain one independent reproduction of the decisive magnetization value, yet most of the program remains internally consumed. This plan therefore keeps the hypothesis test narrow while adding a literature-backed Mn–Bi phase map and a structure-to-synthesis comparison that other researchers can inspect and challenge without replaying the full route chain. Focus H12 asks whether a Mn-rich Mn–Bi phase can preserve large Mn moments while Bi supplies spin-orbit anisotropy. The D0₁₉ Mn₃Bi anchor has already cleared the preregistered magnetic falsifier: its relaxed cell remains ferromagnetic, the FM state is 128.4 meV/cell below the tested ferrimagnetic seed, CHGNet gives 1.6533 T, and the signed DFT check does not fire. Its predicted Curie temperature is only 405.67 K, so the anchor is a mechanism check rather than a final candidate. The cycle will first establish what Mn–Bi phases and synthesis windows are actually reported, then run the already preregistered gated GGen exploration. Cheap gates and per-site moment semantics v2.2 come before phonons, signed DFT checks, or MAE. A checkpoint after tier 1 must rewrite the expensive half of the quest from the observed survivors. If no candidate earns tier 2, the remaining compute items become explicit closure and failure-map deliverables rather than forced calculations. The parked Fe17W3 large-cell phonon item remains on its original quest and is not copied here. No raw HTTP wrapper or substitute service will be created; only first-class Ouro routes may supply compute. What is different Recent quests centered on route conformance, single-cell reproduction, magnetization calibration, and receipt-heavy decision dossiers. This plan returns to chemistry, but it does not merely swap in another ternary screening conveyor. Its new work type is a machine-readable Mn–Bi phase and prototype-neighborhood map that joins reported phases, synthesis conditions, magnetic measurements, predicted structures, and structural similarity. That map must expose whether a calculated survivor resembles something a synthesis chemist could plausibly reach, and it remains useful even if H12 is refuted.