Changed devcontainer dev stack to match Admin + Portal default

no ref

pnpm dev's default frontend fan-out was narrowed to Admin + Portal only
(#29104/#29105), since most sessions never touch the public UMD apps and
those watchers are the heaviest processes in the stack. The devcontainer's
start-dev-stack.sh hardcoded the old full project list independently of
root pnpm dev, so it needed the same trim to actually get the memory
savings inside Codespaces/devcontainers. Public apps remain available
via an explicit nx run-many invocation, called out in the script's output.

Author: 9larsons

.devcontainer/start-dev-stack.sh

@@ -20,8 +20,12 @@ nohup pnpm --filter ghost dev >> /tmp/ghost-backend.log 2>&1 &
 disown
 
 { echo "=== $(date -Is) starting frontends ==="; } >> /tmp/ghost-frontends.log
+# Matches root `pnpm dev`'s default fan-out (Admin + Portal only) — most
+# devcontainer sessions never touch the public UMD apps, and those watchers
+# are the heaviest processes in the stack. To also start them, run e.g.:
+#   pnpm nx run-many -t dev --projects=@tryghost/comments-ui,@tryghost/signup-form,@tryghost/sodo-search,@tryghost/announcement-bar,@tryghost/admin-toolbar
 nohup pnpm nx run-many -t dev \
-    --projects=@tryghost/admin,@tryghost/portal,@tryghost/comments-ui,@tryghost/signup-form,@tryghost/sodo-search,@tryghost/announcement-bar \
+    --projects=@tryghost/admin,@tryghost/portal \
     >> /tmp/ghost-frontends.log 2>&1 &
 disown
 
@@ -33,4 +37,8 @@ Ghost dev stack starting in the background.
   Gateway:      http://localhost:2368/
 
 Give it ~30-60s, then open http://localhost:2368/ghost/ for admin.
+
+Only Admin + Portal dev watchers start by default. To add the public UMD
+apps (Comments, Signup Form, Sodo Search, Announcement Bar, Admin Toolbar):
+  pnpm nx run-many -t dev --projects=@tryghost/comments-ui,@tryghost/signup-form,@tryghost/sodo-search,@tryghost/announcement-bar,@tryghost/admin-toolbar
 MSG