Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Major federal-devolution package legislated 2012-2014 under the Di Rupo government: splitting of the Brussels-Halle-Vilvoorde judicial and electoral district (implementation of 2010 Cour Constitutionnelle ruling); transfer of ~€20bn in competences to Regions and Communities (family allowances, parts of labour-market activation, justice/law-enforcement components, parts of health-care and elderly-care, tax-autonomy expansion); Senate reform to indirectly-elected body; constitutional-court 'bijzondere wet' implementing legislation. Hailed as the unlock to a decade of Belgian communitarian stalemate.
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.