- Add V3 schema with discriminated union on 'mode' field
- Smart mode: uses displayRules for conditional per-problem scaffolding
- Manual mode: uses boolean flags for uniform display across all problems
- Add automatic migration from V2 to V3
- Add manual mode presets (fullScaffolding, minimalScaffolding, etc.)
- Update WorksheetConfig and WorksheetFormState types to support both modes
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Co-Authored-By: Claude <noreply@anthropic.com>
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