README: document today's shipped work (story reactions/comments, per-pet
insights dashboard, DESIGN.md/PRODUCT.md design system, admin panel visual
pass) in "What's Shipped" and the admin panel section.
docker/rolling-deploy.sh and start.sh were tracked as 100644 (no executable
bit) since this repo is worked from Windows, which never records it — every
fresh git pull onto the Linux NAS made them non-executable again. Fixed via
git update-index --chmod=+x so this doesn't recur.