Try the Rednote anonymous explore feed API

- `items` holds public note cards only: `note_id`, `note_url`, `xsec_token`, `type`, `title`, `cover_url`, `liked_count`, and a public `author` card. Description, comments, coordinates, and any account or private field are not part of the anonymous feed. - `note_url` is `https://www.rednote.com/discovery/item/<note_id>` for the card's note id. The separately returned `xsec_token` is a short-lived value: re-run this endpoint for a fresh card and token rather than reusing an old one. Note detail, search, and user profiles are not available on this anonymous surface, so `note_url` is an identifier/link for the caller rather than a promise that a detail call will succeed. - `count` is the number of usable cards in this one response (typically 20 to 35). Cards missing a note id or card body are dropped; if no usable card remains, the endpoint reports an upstream error instead of returning an empty success, so `count: 0` is not a normal result. - `channels` is the channel list the upstream served with this page. Its ids and names are dynamic data from the page rather than a fixed catalog, and the default recommendation feed is reported as `homefeed_recommend`. Cache the list from a response, but do not assume it is stable across sessions. - `channel_id` is the channel the upstream actually served; it may differ from the request when `channel_id` was omitted. - A login or risk-control gate served in place of page state (for example an HTTP 200 challenge page, a redirect to a login or risk page, HTTP 461, or HTTP 403/406/429) is reported as an upstream `503`, not as an empty feed.