doc: refactor project structure and update documentation for C++23 compliance - Updated Philosophy-and-Principles.md to reflect C++23 usage and added new principles. - Renamed Phase 2 in Roadmap.md to "Architecture Refactor & Modularization" and marked it as completed, detailing the refactor into 16 flat modules and migration to xmake. - Revised Phase 3 and Phase 4 in Roadmap.md, updating tasks and success criteria for clarity and accuracy. - Enhanced Scientific-Contributions.md to specify Jacobi decomposition implementation in C++23. - Overhauled Tech-Stack-and-Build.md to reflect changes in the build system, compiler requirements, and module organization. - Updated Vision-and-Objectives.md to clarify the BCI integration and module architecture, emphasizing the flat modular design.
docs: enrich project documentation with detailed architecture, BCI metrics, and implementation status updates
docs: add comprehensive project wiki covering technical details, roadmap, and performance results.