Add Three.js renderer for half_braid geometry with variational elastic curves
- web/zigzag-renderer.jsx: React component with full variational curve solver
- Minimizes E = τ·Σ|Δp|² + β·Σ|Δ²p|² + κ·|p_mid - waypoint|²
- Solves tridiagonal + pentadiagonal linear system via Gaussian elimination
- Self-loops rendered as parametric curves offset toward waypoint
- Wire coloring by group: input (blue), crossing (purple), output (green)
- web/index.html: Minimal HTML loading React/Three.js from CDN
Features:
- Interactive orbit controls (drag + wheel zoom)
- Control panel with sliders: Tension τ, Bending β, Waypoint κ, Resolution
- Toggles for waypoints, surfaces, labels
- Dark theme with gold accents
Coordinate mapping: coord[0]→z, coord[1]→y, coord[2]→x with scale 1.2
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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