v2.6.9

PgVector(prefix_match=True) used to be a silent no-op: it appended a * and then routed through websearch_to_tsquery, which ignores wildcards. It now routes through to_tsquery with proper tokenization, so a partial query like "ani" full-text matches "animal" the way the docs always described. A new cookbook walks through the help-center typeahead use case it unlocks.