CCSS Compiler

Compiles GSS-flavored Constraint Cascading Style Sheets (CCSS) rules into an AST for consumption by the GSS engine. Current stable version is 1.1.3, with irregular releases. It supports parent context (`^`) and global scope (`$`) selectors, variable hoisting, and addresses cross-browser issues. Key differentiator: part of the Grid Style Sheets (GSS) ecosystem for constraint-based layout, as opposed to traditional CSS.