RustViz 1 — final tutorial state

Snapshot of the RustViz 1 tutorial just before the RustViz 2 port landed on master. Preserved for reference.

This is the long-standing version of the tutorial used in the EECS 490 Rust unit at the University of Michigan. Visualizations are pre-rendered SVGs hand-generated through the RustViz 1 annotation-based pipeline and embedded directly via <object> tags in each chapter's markdown.

Subsequent commits on master migrate the book to RustViz 2, where visualizations are generated automatically by the rustc plugin via the mdbook-rustviz preprocessor — no per-snippet hand-edited annotations.

A matching rv1-final branch points at the same commit if you'd rather check out a working tree.