Noindex Thank-You and Utility Pages in Rank Math with AI

My WordPress site uses Rank Math SEO. Keep my utility pages out of search results.

1. List my published pages and find the ones that are only useful after an action: [thank-you, order confirmation, download, login or account pages, or name your own]. For each, give me the title, ID and URL, and fetch the page to show its current robots meta tag. Skip any that already say noindex. If my site has Discourage search engines turned on in Settings, Reading, stop and tell me instead, because every page will show noindex.
2. Wait for me to confirm the list.
3. For each confirmed page, read its current robots with rank-math/get-post-seo-meta, then set noindex with POST /rankmath/v1/updateMeta and the body {"objectID": [page ID], "objectType": "post", "meta": {"rank_math_robots": ["noindex"]}}. Keep any nofollow, noarchive, noimageindex or nosnippet that get-post-seo-meta shows now, because the page's own setting replaces the post type and global defaults. Never include index or follow in the list, never send objectID 0, and change nothing else on the page.
4. Fetch each page again and confirm its robots meta tag now contains noindex. If a page still shows index, check for a page cache before reporting a failure.
5. Tell me how to undo it for any page, and that my sitemap keeps listing these pages until I open the Pages list (Posts for a post), hover the page, click Quick Edit, then Update for one of them, because Rank Math only rebuilds its sitemap on saves made in wp-admin, and on a plain install a block editor save is not one.