Expand adaptive learning experience

[Developer668]

What changed

• Adds generated and authored lesson experiences, adaptive question banks, study questions, note-answer comparison, and the learning companion.
• Expands simulation/runtime routing, curriculum media, worker endpoints, contracts, and database evidence support.
• Refreshes the learner UI, navigation, styles, documentation, evaluations, and test coverage.

Why

This publishes the latest integrated Perception Learn experience as one reviewable snapshot, including the new AI-assisted learning flows and supporting backend/runtime behavior.

Impact

Learners gain richer guided lessons, generated textbook experiences, interactive study support, and broader curriculum media. Developers gain updated contracts, routes, migration support, and regression coverage.

Safety and validation

• Audited publishable files for credential patterns and exact local environment-value leakage.
• Kept .env, .env.local, .dev.vars, and .insforge configuration out of Git via ignore rules; .env.example contains placeholders only.
• npm run check passed: 28 test files / 157 tests, 3/3 offline evaluations, TypeScript, Cloudflare type generation, and production build.