Build and independently verify the launch dataset. Acceptance: - [ ] At least 20 publishable claims across five categories - [ ] At least 40 distinct sources - [ ] Every published claim has sources, establishes, does-not-establish, response, classification, confidence, and verification date - [ ] High-confidence items meet the primary-plus-corroboration rule - [ ] Rumor/rejection log remains private to the repository research process - [ ] JSON schema and factual-contract tests pass - [ ] A second audit reconstructs every headline number from cited records