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 person / company / organization,
subject queries do not call Wikidata (resolved stays null). 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.
