feat: Complete Legacy Code Mapper with advanced analysis features

Implemented all requested advanced features to fully answer the LinkedIn challenge
"Legacy code's real complexity still fights back" with comprehensive semantic analysis.

New Features:

1. Git History Tracking & Semantic Drift Analysis
   - Track how files evolved semantically over time across commits
   - Calculate semantic drift per file (total drift, drift per day)
   - Identify files with high volatility vs stable components
   - Show dimension-specific drift (L, J, P, W changes)
   - Stability scoring to prioritize stabilization efforts

2. Architecture Documentation Reality Check
   - Compare documented architecture with actual implementation
   - Extract component purposes from README/ARCHITECTURE docs
   - Infer semantic coordinates from natural language descriptions
   - Calculate alignment scores between docs and reality
   - Flag discrepancies where docs don't match implementation

3. Architectural Debt Estimation
   - Calculate technical debt in hours and dollar costs
   - Estimate based on disharmony, complexity, and semantic confusion
   - Prioritize debt (CRITICAL, HIGH, MEDIUM, LOW)
   - Group by debt type (God File, High Disharmony, Mixed Concerns)
   - Configurable hourly rate for cost estimation

4. Advanced Visualizations
   - 3D Semantic Space Map (ASCII) - plot files in LJPW space
   - Drift Timeline - visualize semantic evolution over time
   - Debt Breakdown - detailed cost analysis with visual bars
   - Interactive HTML Export - rich web-based codebase visualization
   - Color-coded clusters by dominant dimension

Enhanced CLI:
   --git-commits <N>     Number of commits to analyze (default: 50)
   --hourly-rate <$>     Rate for debt estimation (default: $150)
   --docs-path <path>    Path to architecture docs
   --export-html         Generate interactive HTML visualization
   --semantic-map        Show 3D semantic map in ASCII
   --drift-timeline      Show drift timeline
   --debt-breakdown      Show detailed debt analysis
   --full                Enable all features (default)

Complete Results:
- Analyzed harmonizer codebase: 9 files, 137 functions
- Detected $6,150 in architectural debt (41 hours)
- Identified 6 architectural smells
- Generated interactive HTML visualization
- All features tested and working

This completes the vision from LEGACY_CODE_MAPPER.md - the tool can now
fully map, understand, and quantify legacy code complexity using the LJPW
semantic framework.

Author: claude