- Delete wren_io.c, wren_io.h, and io.wren source files
- Remove multi-arity print overloads and IO.read/IO.time methods
- Add System class with print, printAll, write, writeAll methods to core.wren
- Update all documentation examples and README to use System.print instead of IO.print
Remove the `;` case from the `nextToken` function in `wren_compiler.c` so that semicolons are no longer lexed as `TOKEN_LINE`. Update the documentation in `doc/site/syntax.markdown` to describe newlines as the sole statement separator, and adjust all test files (`test/limit/many_constants.wren`, `test/limit/many_globals.wren`, `test/limit/too_many_constants.wren`, `test/semicolon.wren`) to reflect that semicolons now produce an error instead of being treated as line breaks.
Replace the static `Value globals[MAX_GLOBALS]` array in WrenVM with a dynamic `ValueBuffer` that grows on demand, removing the 256-global limit. Introduce `wrenDefineGlobal()` helper that adds a named global to the symbol table and stores its value in the buffer, returning -2 when the 65536 limit is reached. Update all global access sites (compiler emit, runtime interpreter, GC marking, debug disassembly, core class definition) to use the buffer's data pointer and short (16-bit) opcode arguments instead of byte-sized ones. Add a regression test `many_globals.wren` that defines 8200 globals to verify the new capacity.
Bob Nystrom