Shell & micro-frontend UX coherence — a demo-prep session pivots from patching into a broad-scope spec, four sibling stubs, and the framing of augment-it's dual identity

What started as live demo-prep — patching a sticky Fire button, wiring a dead 'Do another round' affordance, adding a navigation to where results land — became a verdict: augment-it's affordances hide, die, mismatch, and (a newly emerging fourth shape) misname. Rather than patching one more thing, the session pivoted to spec mode. The result is a whole-shell UX coherence audit with eight locked decisions, twelve evidence items, four surfaces audited, and three open architectural questions; four sibling context-v stubs (per-remote in-app API docs, initial user experience, the dual-identity blueprint, the auth-patterns-following-Astro-Knots blueprint); and a substantive pickup doc so the next session can resume cold. No code shipped from the spec arc itself — everything held at the sign-off gate — except three small forward-affordance fixes that landed alongside as a separate fix commit and are recorded in the spec's evidence log.