Cross-domain search

Cross-domain search over Dapper's full document corpus — bills, regulations, consultations, news, and transcripts together. Tries hybrid search (semantic similarity + lexical/keyword RRF + cross-encoder rerank) first; if that's unavailable, timed out, or finds no semantic hit above min_similarity, falls back automatically to a plain title/number substring match over the same corpus — check meta.mode ('semantic' or 'keyword_fallback') to see which one answered. Returns the top-K most relevant chunks as document stubs: title, source URL, domain, and similarity score (null for keyword-fallback hits, which have no similarity concept) — use get_document(id) for the full snippet. Use this when the domain is unknown or you want results mixed across domains; pass domain= to scope to just one. If you already know the domain and want full structured rows back directly (not just a title/url stub), prefer that domain's own q param instead — e.g. list_bills(q=...) or list_regulations(q=...) — it hits the same underlying search but skips the extra get_document round-trip. Accepts queries in Spanish, Portuguese, or English. Optionally scope by publish date with since/until. Results are always constrained to the countries your API key can access.