v0.8.0 - Production Facelift & Headless Validation Suite

Highlights in v0.8.0

• Overhauled Documentation: Complete inspectable engineering guide for BESS, battery RC models, EKF, OCV hysteresis, thermal liquid cooling, and power converters.
• Repository Cleanliness: Added standard MATLAB/Simulink .gitignore and updated CONTRIBUTING.md.
• Automated Verification: Headless
  un_all_checks suite asserting numerical bounds and physical balance without UI rendering overhead.