Get a lead by GLID (one-call lookup)

Full lead detail by GLID — the persistent human-readable reference (e.g. GL-CO-00042).

Use this when you already know a lead's GLID (from a CRM, a Slack message, a customer email, etc.) and want its full record in one call. Equivalent to calling POST /leads/browse with {"filters":[{"field":"lead_ref","op":"eq",...}]} then GET /leads/{entity_id} — but one HTTP hop instead of two.

GLIDs are case-insensitive; the canonical form is uppercase. Returns the same shape as GET /leads/{entity_id}. Contact fields are masked under the commerce free/paid boundary; the response's access_level field signals "full" vs "preview".