Creates a technical report documenting the entire repository structure, components, and APIs, with Complex Tetris mode isolated in an experimental section. The report is formatted for PDF printing with page breaks and a table of contents.

Changes

• REPORT.md: New comprehensive documentation covering:
  • Project structure and tech stack overview
  • Core components (TetrisGame.jsx, ComplexVisualizer.jsx)
  • Utility module APIs (complex.js, tetris.js) with function tables
  • Test coverage and CI/CD pipeline
  • Mathematical background on complex number rotations

PDF-Printable Format

The report includes formatting for clean PDF export:

• Title page with version, date, and repository metadata
• Clickable table of contents with section links
• Page break hints (<div style="page-break-after: always;">) between major sections
• Horizontal rule separators for visual clarity
• "End of Document" marker

Experimental Section

Dedicated section for ComplexTetrisGame.jsx documenting:

• Non-standard transformation functions (z², eᶻ, 1/z) beyond standard i·z rotation
• Grid snapping implementation and its artifacts
• Wall kick system for invalid positions
• Known limitations (unpredictable shapes, game balance)

// Example: Complex transform with grid snapping
const transformed = piece.map(pos => Complex.applyFunction(transform, pos));
const snapped = transformed.map(pos => 
  Complex.complex(Math.round(pos.re), Math.round(pos.im))
);

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