Back to Search-quality baseline: cross-source canonical (Phase 1.2, v1.2.0 candidate)

Baseline | Class | Headline
--- | --- | ---
`search-quality-baseline-v1.2.0.md` | A + B (canonical lookup + framework root) | MRR 0.9467, P@1 perfect on 46/50
`search-quality-deprecation-baseline-v1.2.0.md` | E (deprecation-aware) | Swift wins 30/30, sign-test p = 0.0078
`search-quality-crosssource-baseline-v1.2.0.md` (this doc) | F (cross-source canonical) | 19/19 OK when expected source present in top-10, p = 1.9 × 10⁻⁶. 6/25 reveal that HIG/apple-archive are systematically out-competed by apple-docs (by design).

Three of eight query classes from §1.4 now have documented baselines. Five remain: C (acronym), D (CamelCase fragment), G (prose), H (symbol-attribute), and Phase 1.7 agent-end-to-end.