Analysis pipeline and aggregate results for "Students' reflective journals in linear algebra: structural and contingent patterns across two cohorts"

This deposit contains the re-executable analysis pipeline and aggregate results for a two-cohort study of weekly reflective journals in an introductory linear algebra course. It accompanies a manuscript submitted to the International Journal of Mathematical Education in Science and Technology. The underlying corpus of student journals is NOT included and is not publicly available, to protect student privacy (ethics approval: Comité Ético Científico en Ciencias Sociales, Artes y Humanidades, Pontificia Universidad Católica de Chile, ID 260727007). Everything in this deposit is either code or aggregate output containing no personal data: the deterministic analysis scripts, the aggregate results behind every figure and table reported in the manuscript (results_ch1.json, results_ch2b.json, results_CH1_rerun.json), and the symmetric anonymisation audit script with its protected-vocabulary list.