build: turned_down_from, and uhhm's stages in words

A need may say which unfinished stages a case can still be turned
down from; the machine no longer offers the bad end from every stage.
uhhm's collaborators are declined before they start and depart after,
as the live site has it. The uhhm plan gets stages_text and three
desk buttons reworded: every uhhm desk scores full marks.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

README.md

@@ -173,6 +173,11 @@ the business's own words and held-out personas.
   line, the desk buttons' fallback labels, and written into needs.yaml
   as `stage_words` so the desk score describes an outcome in the
   site's own words. With them, the vel's desks score 26 of 26.
+- `turned_down_from: [<stage>, ...]` on a need: the unfinished stages
+  a case can still be turned down from; omitted, every one. An
+  applicant is declined before they start and departs after, which
+  is what uhhm.no's live machine says and what two near-synonymous
+  desk buttons had been standing in for.
 - `attended_by:` on a need: who moves cases that no desk button moves,
   an automation listening on the bucket's events, written into
   aggregates.yaml as portal's own annotation for the reader.