Tour: gestures tile + merged tile; fix card spacing/highlight

Pre-render ⓘ tour audio (FIXED_LINES + startup prefetch)

Redesign: 'A Window of Wonders' — Fraunces/Nunito, dawn-to-dusk palette, Pip's twilight window, storybook cards

Speed: cache + pre-record lesson audio (instant playback) + optional KEEP_WARM

Add Modal GPU inference app + MODAL_BASE_URL routing (slice 2)

Warm only voicing path at startup (don't pin CPU loading the brain)

Fix thread oversubscription on free CPU Space (cap to cgroup quota)

Pre-warm models at startup (kill first-call cold start) + thread-safe lazy loaders

Professor Pip — kids learning avatar (courses, make-your-own, safety gate, browser lesson engine)