Returns detailed benchmark data for a single company job title, optionally scoped to a specific location. The response includes the company pay range derived from current employees, the internal pay band configured for the job (if any), Mercer benchmark details when a Mercer benchmark is linked, every saved benchmark for the job/location (empty when none exist), and per-employee salary and compensation stats. Use GET /api/v1/compensation/benchmarks to find valid jobId and locationId values.