Understand existing Unity UI Toolkit code, make targeted edits, generate new UXML/USS files, Manipulators, and handle UI runtime binding. References Read these as needed: - references/uss-guide.md — USS patterns and examples - references/svg-icons.md — SVG icon generation (only when generating icons) - references/common-issues.md — Common mistakes to avoid - references/ui-runtime-binding.md — Patterns and guide to bind data to UI at runtime (only when requested or when bindings are involved) - references/painter2d.md — Painter2D API for custom visuals: gradients, shapes, arcs, procedural draw…