List acquisitions for an entity

VISIBILITY-GATED READ: a row is returned only when BOTH the acquired and acquirer entities are publicly visible. An acquisition relationship that already exists (and is visible in the entity relationships resource) but returns 404 here means one counterpart entity is still hidden -- publish that entity (statusSitemapShow=true, statusHidePage=false) -- it is an unmet visibility prerequisite, not data-layer inconsistency or projection lag. The acquired/acquirer roles in each row are always declared explicitly in the response via the acquiredEntity and acquirerEntity fields. The role query parameter only selects which side the path entity occupies in the WHERE clause: acquired (default) lists acquisitions where the path entity was bought; acquirer lists acquisitions where the path entity was the buyer; all lists or reads both sides in one response. Writes (POST/PUT/PATCH/DELETE) ignore role and always treat the path entity as acquired. List responses are ordered by most recent acquisition event first.