v0.42.0 — source reuse rights (license-scan)
Each candidate can now carry its reuse rights — oa_status (gold/green/hybrid/bronze/closed) and license (e.g. cc-by) — filled from OpenAlex (already called for retractions) by DOI/PMID. Surfaces: 'citevahti license-scan --json', a panel '⚖ Scan licences' button, a neutral chip on the candidate card, and the two fields in the candidate API.
Reports, never decides: it records what the source's licence IS so a human (or a downstream content hub) can judge reuse — CiteVahti never says a source is OK to republish. Unknown/offline leaves the fields unset. No new egress (OpenAlex already disclosed).
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