First UI for the ops team: a local sign-in page where an owl sits on
the card, watches the password field as you type, shakes its head on
a wrong password and hops on the right one. Uses a test password for
now; where the real G2 password lives is still undecided.
Also adds PRODUCT.md (product context for UI work) and the page's
design brief under .impeccable/surfaces/.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
