GET /api/v1/entities/search with a subject to find curated articles
whose extracted themes mention a topic — a case-insensitive substring match
against metadataJson.themes. Unlike ticker / person / company /
organization, subject queries do not fill matchedEntity.
Same catalog as topic search (isCurated, not disabled). Free, no auth
required.
Request
The endpoint requires at least one ofticker, company, person,
organization, or subject.
Response
publishedAt, most recent first — use this to browse
a named theme by recency. Broad “what are analysts saying about X?” research
still belongs on /api/v1/search.
