Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Constitutional amendment package agreed at Meech Lake conference 30 April 1987 by Mulroney and all 10 premiers to secure Quebec's endorsement of the 1982 Constitution. Recognised Quebec as a "distinct society," gave provinces input on Supreme Court and Senate appointments, required unanimity for further changes. Required ratification by all provincial legislatures within three years. Failed 22 June 1990 deadline — Manitoba MLA Elijah Harper (Oji-Cree) held the Assembly open blocking unanimous consent; Newfoundland Premier Wells declined to schedule a vote. Triggered Bloc Québécois formation (Lucien Bouchard) and 1995 referendum.
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.