Methodological Clarification of Outer Rotation-Curve Slope Measurement in the SPARC Sample

This record provides a methodological clarification of outer rotation-curve slope measurement in the SPARC galaxy sample. It defines the current empirical scope of valid conclusions in the ongoing SPARC-based analysis program, and explicitly separates a reproducible kinematic baseline from a currently non-robust morphological observable, κ. The document does not introduce new empirical results. Instead, it formalizes the present status of the analysis pipeline, clarifies the fiducial outer-slope definition, and specifies which interpretations are currently supported and which remain hypothesis-level. This work is a methodological supplement to the outer-slope baseline analysis presented in:https://doi.org/10.5281/zenodo.18910574