Immigration policy openness — work visas, family reunification, asylum processing, border enforcement posture.
Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Merz-era 'Migrationswende': indefinite extension of internal-Schengen border controls initially reintroduced in 2023-24, expanded powers for direct rejection at the border (Zurückweisung) of asylum-seekers from safe-third-country transits, accelerated deportation framework (Rückführungsverbesserungsgesetz 2.0) including custody for removal, suspension of family reunification for subsidiary-protected status, and reprioritised Fachkräfteeinwanderung for skilled legal channels. Coded as a strong contraction on the immigration-openness axis relative to the Ampel-era citizenship and asylum posture.
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.