Submit Enrich Ground Truth

Submit ground-truth re-ranking for an enrich event.

An enrich output ranks candidates per enriched field, each candidate carrying a stable id. This endpoint records the client's own ranking of those candidates (by id) as ground truth, for later ranking-quality metrics.

Per field, rankings gives each candidate a 1-based rank (lower = better); ties and gaps are allowed, and candidates left out are treated as unranked. Every id must appear in that field's enrich output. Re-submitting overwrites.

Non-enrich events return 400, matching POST /v3/events/{eventID}/feedback, which reports an unsupported function type the same way. A body that is structurally invalid (missing path, empty rankings, rank < 1, duplicate ids) also returns 400; a body that is well-formed but does not match the output (unknown field path, unknown candidate id) returns 422.