CodeClone 1.1.0: AST + CFG clone detection, HTML report

Added

• Control Flow Graph (CFG v1) for structural clone detection
• Deterministic CFG-based function fingerprints
• Interactive HTML report with syntax highlighting
• Dark/light theme toggle in HTML report
• Block-level clone visualization

Changed

• Function clone detection now based on CFG instead of pure AST
• Improved robustness against refactoring and control-flow changes

Documentation

• Added docs/cfg.md with CFG semantics and limitations
• Added docs/architecture.md describing system design