v0.2.0 — Equation-Consistent Refactor Across All Chapters

This release focuses on systematic refactoring and correctness, aligning all example implementations with the exact equation numbering and definitions in the book Principles of Indoor Positioning and Indoor Navigation.

Compared to the previous release, this version is significantly more stable and pedagogically reliable, especially for teaching, self-study, and research replication.

Backup the IPNL repo (when the book is not published)

This release is mainly done by Guohao Zhang. Since the whole structure is revised. This verision is less useful now.