zdmd: From DESIGN.md to Web Standards

DESIGN.md stores a design system as YAML token blocks inside a markdown file. Agents and developers can read, review, and diff it like any other document. zdmd is a Java port of the reference TypeScript CLI: a zero-dependency Java 25 application packaged as a single executable JAR. It lints, diffs, and exports DESIGN.md token files. One JAR replaces node_modules for anyone working with design…