Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Binding referendum 6 November 1993 (held concurrent with general election) replaced first-past-the-post with Mixed-Member Proportional representation — 53.9% Yes. First MMP election October 1996. The reform was a direct institutional-constraint response to the executive-dominant Rogernomics and Ruthanasia eras of 1984-1993 in which unified governments had pushed through structural reforms without corresponding popular support.
Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.
Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".
Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.