Propose-a-change: pick the file from the repo itself

target_path becomes a select whose options are the live listing of
questions/ from Gitea's contents API (the engine's existing
select-from-resource mechanism - no code change), with a free path
field kept for proposals that create a new file. No more hand-typed,
typo-able paths for existing pages.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

questions/develop-proposal.yaml

@@ -31,11 +31,26 @@ alternatives:
             type: email
             optional: true
       - name: The change
-        description: ""
+        description: >
+          Pick the page you're changing — or name a new file's path if
+          the proposal creates one.
         requirements:
           - name: target_path
-            label: File path
+            label: The file to change
+            type: select
+            optional: true
+            id_field: path
+            resource:
+              public: true
+              source:
+                kind: url
+                url: https://project.uhhm.no/api/v1/repos/uhhm/questions/contents/questions?ref=main
+              jq: >
+                .[] | select(.type == "file") | {path: .path, name: .name}
+          - name: new_path
+            label: Or a new file's path
             placeholder: questions/example.yaml
+            optional: true
           - name: rationale
             label: The rationale
             type: textarea