Local Non-Detection Does Not Necessarily Imply Global Exclusion: A Minimal Computational Toy Model of Reduced Observational Pipelines

This technical note presents a minimal computational toy model examining when local non-detection within a reduced observational pipeline does not justify unrestricted global exclusion. A synthetic one-dimensional latent field is observed through two pipelines: a full pipeline with access to the entire domain and a reduced pipeline restricted to a local observational window. Total latent support is held fixed across regimes, while only the distribution of that support relative to the reduced window is varied. The results show that full-domain detection remains approximately stable across regimes, while reduced-pipeline detection depends strongly on support geometry. Local non-detection may therefore justify only interface-local absence unless the reduced pipeline preserves the support class relevant to the exclusion claim. The contribution is diagnostic and methodological. No new physical model, statistical method, or domain-specific ontology is introduced. The record includes a reconstructed reproducibility bundle with executable code, support templates, summary outputs, metadata, figure, notebook, and checksum information.