22 (synonym, canonical_URI) pairs, all drawn from framework_aliases.synonyms rows in the v1.2.0 candidate DB (excluding data and text as too-generic). For each: run cupertino search "<synonym>" --limit 10, find rank of the canonical framework URI. Aggregate: count top-1 hits, in-top-5, in-top-10, MRR. Binomial test on top-1 hit rate vs chance.
Harness source: /tmp/cupertino-search-eval-acronym.py (not yet versioned in repo). Full JSON dump: /tmp/cupertino-search-eval-acronym-20260520.json.