[quest] Quiz bank expansion — Worlds 1-3

[noevidence1017]

📘 Description

Expand the quiz question bank for Worlds 1–3. Each world's quiz quests should offer a deeper pool of questions.

✅ Acceptance Criteria

• ≥10 quiz questions per world (Worlds 1–3), each a valid QuizQuestion with 1 correct option and a teaching explanation.
• Difficulty ramps within each world.
• Sourced from https://developers.stellar.org/docs; no factual errors.

🔧 Context AI

Files to modify: packages/content/src/worlds/world-1-origin-plains.ts, world-2-wallet-kingdom.ts, world-3-asset-forge.ts
Files to reference: packages/content/src/curriculum/types.ts (QuizQuestion)

📋 Additional Notes

Avoid trick questions; every wrong answer should be plausibly educational.