Add portal_project_inquiries/portal_subscribers durable storage, review dashboard alternatives, newsletter compose

- index.yaml: record_as on "I want something built" and "Keep me
  posted" - those submissions previously only existed as a NATS
  event, nothing durable, despite promising a reply/subscription.
- review.yaml: consolidated into one dashboard question with four
  alternatives (Applicants, Inquiries, Subscribers, Compose
  newsletter) rather than separate pages per resource.
- Compose newsletter has no record_as/resource of its own - an
  automation (n8n) filters portal.answers.submitted directly for
  question_id == "/review" && alternative == "Compose newsletter",
  matching events.rs's own "gain a second subscriber" design.
- lint.sh: allow type: prosekit (the new rich-text requirement kind).

lint.sh

@@ -39,15 +39,16 @@ for f in "$dir"/*.yaml; do
 		fail=1
 	fi
 
-	# "textarea" and "file" are the two values content.rs special-cases;
-	# anything else is passed straight through as an HTML <input type>
-	# attribute, so this is the real set of valid values, not a guess.
+	# "textarea", "file", and "prosekit" are the three values
+	# content.rs/app.rs special-case; anything else is passed straight
+	# through as an HTML <input type> attribute, so this is the real set
+	# of valid values, not a guess.
 	bad_types=$(jq -r '
 		[.alternatives[]?.features[]?.requirements[]?
 			| select(.type != null and (.type | IN(
-				"text", "textarea", "file", "email", "tel", "url", "number",
-				"password", "date", "datetime-local", "time", "month", "week",
-				"color", "range", "checkbox", "radio", "hidden", "search"
+				"text", "textarea", "file", "prosekit", "email", "tel", "url",
+				"number", "password", "date", "datetime-local", "time", "month",
+				"week", "color", "range", "checkbox", "radio", "hidden", "search"
 			) | not))
 			| .type]
 		| unique | .[]