Semi-open boundaries keep shocks as random walks in finite-volume particle systems while letting ordinary particles pass.

Only the abstract is available, so no equations, rate formulas, coupling constructions, or internal derivations can be inspected for self-definitional reductions, fitted parameters renamed as predictions, or uniqueness theorems imported from the author's prior work. The abstract states a constructive claim: boundary mechanisms for ASEP and the exponential bricklayers model that preserve the known infinite-volume distributional structure of shocks as interacting second-class particles, now in finite volume with semi-open ends, and thereby yield nontrivial two-species non-reversible stationary distributions. This is ordinary sequential research building on previously published infinite-volume results; self-citation of that background is not load-bearing circularity under the stated rules. No fitted inputs, no renaming of known empirical patterns, and no tautological redefinition appear in the text that can be quoted. Per the hard rules, an honest non-finding with empty steps is required when the available text supplies no exhibit of circular reduction. Residual risk that the full paper might contain self-referential steps cannot be converted into a positive circularity score without quotable evidence.