When Maps Explain Themselves: Legends, Style, and Finished Images in Ruby

libgd-gis v0.4.1 introduces built-in legend support as a first-class feature in the Ruby-native map rendering pipeline. Legends are rendered directly into server-side generated images without frontend dependencies, making maps self-describing. The style-driven approach ensures visual consistency between map labels and legends, while the clean separation between rendering and post-processing maintains the library's explicit design philosophy.