List related podcasts

Returns the shows most related to a podcast, best first, each with a calibrated score, a coarse band (strong, moderate, weak) to branch on, and — with include=basis — the signals behind the pairing: content similarity of recent episodes, shared topics, shared guests (named), same publisher, and shared sponsors. Related sets are precomputed per show from its embedded transcripts, topic profile, guest roster, network, and advertisers, restricted to the show's language, and refreshed as new episodes land; the endpoint is a fast page read. Only shows above a relatedness floor are listed, machine-generated and farmed feeds are never listed, and a publisher's duplicate feeds of one show appear once (sets computed before that rule are collapsed on read, best-effort). An empty first page is 200 with a coverage note saying whether the set is not computed yet, nothing cleared the floor, or the filters removed everything — never 404. Use this for "shows like this show" — media planning around a known show, PR pitch lists, and agent traversal from one resolved slug to its neighbours. It is not a topic browser (use GET /v1/podcasts?topic_id=… for shows that cover a topic), not a guest lookup (GET /v1/podcasts/guests/{id}/podcasts lists where a guest has appeared), and not advertiser co-occurrence (GET /v1/podcasts/advertising/co-occurrence). Every result carries the related show's slug, which every other podcast endpoint accepts as {id}; person slugs in the basis feed the guest endpoints and topic slugs feed topic_id. Identify the podcast by slug (e.g., 'all-in'), internal ID, or numeric iTunes ID.