Watch for `pages/` creation when default page displayed

Editor assessment

The subject states both the trigger and the behavior — the builder watches for `pages/` creation while the default page is displayed — so the header communicates the fix and its scenario without the diff, and fix(builder) classifies and locates it correctly. Hygiene is clean: imperative mood, no trailing period, sensible length, no ticket junk. No body is needed for a contained watcher fix, and no footer is required. A line on the stale default page users saw would add depth; the message is already clear, accurate, and publishable at good.