Add support for list literals in the compiler with bracket-delimited syntax and comma-separated elements. Introduce the ObjList runtime type with a contiguous elements array, garbage collection marking, and proper memory deallocation. Expose a `List` class in the core library with a `count` method returning the number of elements. Update the grammar table to register `[` as a prefix token for list compilation instead of an infix subscript operator, and reorder opcode enum entries to place CODE_LIST before the load/store group.
