feat: Add academic task verification and plagiarism detection

[DrDrewCain]

Overview

Implement verification systems specific to academic and writing tasks.

Plagiarism Detection

• Integration with plagiarism APIs (Turnitin, Copyscape)
• Originality score requirement
• Source citation checking
• AI-generated content detection
• Cross-submission checking

Academic Integrity

• Honor code acknowledgment
• Prohibited task types (exams, graded work)
• Educational purpose verification
• Teacher/institution flagging

Quality Verification

• Grammar and spelling check
• Readability scoring
• Citation format validation
• Factual accuracy review
• Expert peer review option

Reporting

• Originality report generation
• Source similarity breakdown
• Recommended improvements