Redesign Magi Reader around solo reading

[dancockrell]

This is an intentionally draft redesign based on real-user testing. The product has been narrowed from a classroom/assessment platform to a focused solo reading experience.

Current product:

• one uninterrupted literary reading instead of three school passes
• narration + subtitles + clickable vocabulary as the core reader
• tapped words feed the vocabulary trainer
• Wren and Grandpa Ambrose frame books before and after, never in the middle
• a separate optional Explore experience for literary/context discussion
• bookshelf and data-only Git book plugins fetched on demand
• The Gift of the Magi bundled as the reference title
• The Raven available from its Git pack for text/narration/subtitles; recovered art still needs publishing
• explicit per-line storyboard packets for start/end keyframes, visual clips, camera, action, mood and duration
• exact Grok production sheets started for Gift scenes 1 and 2 using real narration cue timings

Removed rather than hidden:

• Class/teacher UI, sign-in and roster flows
• three-pass quiz/writing reading modes
• hand-in/submission/outbox persistence
• gradebook, CSV/XLSX export and workbook code
• assessment attempts and grader
• class QR/join infrastructure
• Apps Script classroom backend
• prototype-parity tests that required those removed features

Verification has been rebuilt around the solo product. The current unit suite protects the uninterrupted story track, media/cue alignment, vocabulary, translations, pack switching and Git catalog boundary. Production build and the trimmed test suite are passing; CI is being returned from temporary diagnostic mode to its normal fail-fast workflow.

Still intentionally draft because the remaining work is product polish and migration rather than restoration of classroom features: finish the Gift storyboard backlog, publish/wire Raven art, clean obsolete e2e/docs/tooling, and continue UX/performance passes.