Fine-tune of fastino/gliner2.5-base-v1 (GLiNER2, boundary architecture) for data-use mention extraction (dataset / survey / census / registry mentions in economics research papers). Labels were produced with a locally run LLM through the passage-annotation harness, with human-in-the-loop passage review and adjudication under the project doctrine. Holdout F1 is therefore agreement with the annotating agent, not owner accuracy. - NAMEDDATA — a proper name, title, or acronym of a specific data source - DESCRIPTIVEDATA — a source described in words but not named - VAGUEDATA — generic data wording with no identifiable source 2 gold mention(s) in the holdout sit inside a run the word splitter…