The truth.wren test file is relocated from test/if/ to test/for/, and the test logic is rewritten to use a custom Iter class with for-in loops instead of if statements, while preserving the same truthiness assertions for false, null, true, 0, and empty string values.
Update the VM interpreter to treat null as falsey alongside false in if, while, for, and logical AND/OR operations. Remove the TODO comment and adjust short-circuit logic in OP_JUMP_IF and OP_JUMP_IF_NOT branches. Refactor existing test files into subdirectories (if/, logical_operator/, while/) and add dedicated truthiness tests for each construct. Remove old test/if.wren and update and/or tests to exclude null/0/"" truthiness checks now that null is falsey.
