Collections this org belongs to

Returns the curated collections that include this organization — either because the org itself is a member, or because one of its products is a member (e.g. a coding-agents collection that pins Claude Code surfaces on the Anthropic org page). Deduplicated and ordered alphabetically by collection name. Each item includes memberCount (visible public orgs + products, matching GET /v1/collections). Use GET /v1/collections/:slug for the full collection detail.